(Beyond Pesticides, July 5, 2019) This is a story about a chemical pesticide, a fungicide, in wide use for which the mode of action, i.e., the ability to cause harm, has not been fully understood. It is not a story unique to this pesticide. Rather, it is an important story to consider when deciding to use a pesticide or allowing a pesticide to be used. The question is whether the chemical could be broadly problematic beyond the target organisms, in this case fungi? In its coverage of a study published in March, the American Association for the Advancement of Science publication, EurekAlert, reported that, “The ability of [the fungicide] fludioxonil to act on a sugar-metabolizing enzyme common to all cells, and to produce the damaging compound methylglyoxal, may mean that the pesticide has more potential to harm non-fungal cells than previously thought. Although fludioxonil has been deemed safe for use, the authors . . . suggest that the effects of this widely used pesticide has upon animals be re-examined.” The research study, published in March in Scientific Reports and led by T. Tristan Brandhorst, PhD (in the lab of Dr. Bruce Klein at the University of Wisconsin–Madison and UW School of […]

(Beyond Pesticides, July 1, 2019) France made a decision in May to ban a widely-used fungicide because it damages the endocrine system. In contrast, there has been a stark failure to protect health in the U.S. Despite a Congressional mandate, EPA is not acting on endocrine disruptors linked to infertility and other reproductive disorders, diabetes, cardiovascular disease, obesity, and early puberty, as well as attention deficit hyperactivity disorder (ADHD), Parkinson’s, Alzheimer’s, and childhood and adult cancers. This is a tragedy. Ask your elected members of Congress to demand that EPA tests and acts on regulatory endocrine disruptors as required by law. In 1998, following a mandate in the Food Quality Protection Act (FQPA) of 1996, EPA established a program to screen and test pesticides and other widespread chemical substances for endocrine disrupting effects. Despite operating for 21 years, the Endocrine Disruptor Screening Program (EDSP) has made little progress in reviewing and regulating endocrine-disrupting pesticides.  As of 2019, the program has stalled entirely. To ensure appropriate follow-through, Congress gave EPA a timeline to: develop a peer-reviewed screening and testing plan with public input not later than two years after enactment (August 1998); implement screening and testing not later than three years after […]

(Beyond Pesticides, June 24, 2019) During “Pollinator Week,” last week, the U.S. Environmental Protection Agency betrayed its responsibility to protect the environment and approved “emergency” uses of sulfoxaflor, a bee-toxic insecticide, in 11 states on millions of acres of crops that are attractive to bees. Sulfoxaflor is functionally identical to the neonicotinoid class of systemic pesticides, which are readily absorbed and translocated into the plant tissues, including its pollen and nectar. These insecticides are substantial contributors to the dramatic decline of pollinators and what is now recognized as a global insect apocalypse. Ask Your Elected Members of Congress to Tell EPA that Its Actions Are Unacceptable and Must Be Reversed In 2015, beekeepers sued to suspend the use of sulfoxaflor. A year later, in 2016, the chemical’s registration was amended with the specific exclusion of crops such as cotton and sorghum that attract bees, essentially acting as an aromatic draw to poison. However, EPA regularly utilizes the “emergency exemption” rule under Section 18 of the Federal Insecticide, Fungicide, and Rodenticide Act (FIFRA) to circumvent these restrictions. The Center for Biological Diversity reports, “Ten of the 11 states have been granted the approvals for at least four consecutive years for the same ’emergency.’ Five have […]

(Beyond Pesticides, June 19, 2019) On June 17, 2019, the Environmental Protection Agency (EPA) once again approved “emergency” uses of sulfoxaflor, a bee-toxic insecticide, on millions of acres of crops that are attractive to bees. Sulfoxaflor is functionally identical to the neonicotinoid class of systemic pesticides, which are readily absorbed and translocated by the plant, including its pollen and nectar. These insecticides are substantial contributors to the dramatic decline of pollinators and what is now recognized as a global insect apocalypse. In 2015, beekeepers sued to suspend the use of sulfoxaflor. A year later, in 2016 the chemical’s registration was amended with the specific exclusion of crops such as cotton and sorghum that attract bees, essentially acting as an aromatic draw to poison. EPA regularly utilizes the “emergency exemption” rule under Section 18 of the Federal Insecticide, Fungicide, and Rodenticide Act (FIFRA) to circumvent these restrictions. The Center for Biological Diversity reports, “Ten of the 11 states have been granted the approvals for at least four consecutive years for the same ‘emergency.’ Five have been given approvals for at least six consecutive years.” The EPA’s Office of Inspector General (OIG) has recognized the broad misuse of Section 18. A 2018 report from OIG notes […]

(Beyond Pesticides, June 13, 2019) The U.S. allows the use of 85 pesticides that have been banned or are being phased out in the European Union, China or Brazil, according to a peer-reviewed study published last week by the academic journal Environmental Health. In 2016, the U.S. used 322 million pounds of pesticides that are banned in the E.U., accounting for more than one-quarter of all agricultural pesticide use in this country, according to the study. U.S. applicators also used 40 million pounds of pesticides that are banned or being phased out in China and 26 million pounds of pesticides that are banned or being phased out in Brazil. “It’s appalling the U.S. lags so far behind these major agricultural powers in banning harmful pesticides,” said Nathan Donley, PhD, a senior scientist with the Center for Biological Diversity and author of the study. “The fact that we’re still using hundreds of millions of pounds of poisons other nations have wisely rejected as too risky spotlights our dangerously lax approach to phasing out hazardous pesticides.” The study compared the approval status of more than 500 pesticides used in outdoor applications in the world’s four largest agricultural economies: the United States, European Union, China and Brazil. Report […]

(Beyond Pesticides, June 6, 2019) Pesticide use eliminates pest predators and permits mosquito populations to flourish, according to research conducted in Costa Rica by scientists at Utah State University. The new study, “Adaptation to agricultural pesticides may allow mosquitoes to avoid predators and colonize novel ecosystems,” highlights the dangers of human intervention through broad scale pesticide applications, and the urgent need to consider ecosystem-wide impacts before allowing chemicals to be placed on the market. As lead study author Edd Hammill, PhD, told National Geographic, the investigation got its start after he observed higher numbers of mosquitoes in orange groves he was visiting, when compared to other, non-agricultural areas. “We felt like we were getting a lot more mosquito bites in plantations than in pristine areas and started to wonder why,” noted Dr. Hammill. The study focuses first on the role that bromeliads, a tropical flowering plant that grows on tree branches, play in affecting mosquito populations. Mosquitoes use the water that these plants catch in between their leaves to lay eggs. Many other species are found to lay eggs within the leaves, including the top-level predator in this system, the damselfly. Dr. Hammill’s team looked at community composition within bromeliad […]

(Beyond Pesticides, May 28, 2019) In yet another attack by the Trump administration on science, public health, and children and families, as well as another wink and nod to industries whose products harm, the U.S. Environmental Protection Agency (EPA) and the National Institute of Environmental Health Sciences (NIEHS) are planning to end their support for research centers that do important scientific investigation related to children’s health. Tell Your Congressional Representatives to Insist on Funding for Children’s Environmental Health Centers. EPA has announced that it will no longer renew its grants to these centers. As of July, they will lose a huge portion of the funding that has allowed them to deploy hundreds of scientists — in genetics, toxicology, and neurodevelopment — on unusually comprehensive and longitudinal studies of what factors in children’s experiences and communities impact their health. The work of these centers has been critical in uncovering the relationships between children’s exposures to toxic chemicals, including pesticides, and diseases and health anomalies later on in their developing years. According to Tracey Woodruff, PhD, who runs the University of California, San Francisco Pregnancy Exposures to Environmental Chemicals Children’s Center: When EPA weighs the harms of a chemical against its benefits, ignorance “works out perfectly for industry. . . If EPA doesn’t […]

(Beyond Pesticides, May 23, 2019) On Monday in the conclusion of a lawsuit, the U.S. Environmental Protection Agency (EPA) announced the final notices of cancellation on the registration of twelve neonicotinoid pesticide products in the Federal Register, each of which contains chlothianidin or thiamathoxam as an active ingredient. The decision to pull these products from the market was required as part of a legal settlement under the Endangered Species Act (ESA) in December 2018 of a successful case, Ellis v. EPA, brought by beekeeper Steve Ellis and a coalition of other beekeepers and environmental groups, including Beyond Pesticides. The case establishes a legal precedent in which the court required action to address the bee-toxic effects of pesticides; however, the effect of the settlement and its impact on overall neonicotinoid and other systemic insecticide use is limited. For all but two of the twelve canceled products, a nearly identical surrogate remains actively registered. Furthermore, the fact remains that there are hundreds more products containing the active ingredients targeted by the lawsuit that have not been removed in any capacity – 106 products containing clothianidin and 95 containing thiamethoxam remain untouched on the market. Breaking down the impacts of the EPA ruling even […]

(Beyond Pesticides, May 17, 2019) After two decades of co-sponsoring and co-funding research centers that do important scientific investigation related to children’s health, the U.S. Environmental Protection Agency (EPA) and the National Institute of Environmental Health Sciences (NIEHS) are planning to end their support. EPA has announced that it will no longer renew its grants to these centers. As of July, they will lose a huge portion of the funding that has allowed them to deploy hundreds of scientists — in genetics, toxicology, and neurodevelopment — on unusually comprehensive and longitudinal studies of what factors in children’s experiences and communities impact their health. The work of these centers has been critical in uncovering the relationships between children’s exposures to toxic chemicals, including pesticides, and diseases and health anomalies later on in their developing years. This announcement represents yet another attack by the Trump administration on science, public health, and children and families, as well as another wink and nod to industries whose products harm. Says Tracey Woodruff, who runs the University of California, San Francisco Pregnancy Exposures to Environmental Chemicals Children’s Center: When EPA weights the harms of a chemical against its benefits, this “works out perfectly for industry. . . […]

(Beyond Pesticides, May 16, 2019)  Use of the tree-killing herbicide aminocyclopyrachlor (ACP) is now restricted in Oregon, according to rulemaking finalized last week by the state’s department of agriculture (ODA). While an important step in the right direction, many environmentalists are perplexed by the state’s decision not to proceed with a ban on all uses of the inherently toxic chemical, which has killed thousands of old-growth pine trees along state scenic highways. Over five thousand comments from Oregonians and concerned individuals across the country urged ODA to scrap its convoluted proposed rule and simply eliminate the chemical from state commerce. While advocates will continue to urge ODA to completely eliminate ACP use, the current restrictions did not come without a fight. Public meetings were attended by representatives from the chemical’s manufacturer, Bayer. The company strongly opposed any restrictions on its product, and acted to delay the original implementation date for ODA’s rule. Oregon had intended to finalize the rule in late March. “We were pretty much set to file the final paperwork,” said Oregon pesticide program manager Rose Kachadoorian to The Bulletin. But through the work of its corporate lawyers, Bayer was able to track down an arcane Oregon law that […]

(Beyond Pesticides, May 13, 2019) The Center for Biological Diversity (CBD) filed four lawsuits last week challenging the Trump administration’s failure to release a trove of documents detailing how the administration is regulating dangerous pesticides, especially as they relate to endangered species. Meanwhile, the U.S. Environmental Protection Agency (EPA) released a set of proposed changes last week that would dramatically reduce protections for the nation’s most endangered plants and animals from pesticides known to harm them. The proposals ignore the real-world, science-based assessments of pesticides’ harms, instead relying on arbitrary industry-created models. The EPA proposals would, for example, gut protections for endangered plants that are pollinated by butterflies and other insects by ignoring the fact that animals routinely move back and forth between agricultural areas and places where endangered species live. The proposals follow intensive efforts by Interior Secretary David Bernhardt to halt federal work on protecting wildlife from pesticides. They were released over a year after a draft biological opinion that was scuttled by the Trump administration found that the loss of pollinators from the insecticide chlorpyrifos would put hundreds of endangered species on a path to extinction. The so-called “refinements” will make it easier for the EPA to claim that pesticides […]

(Beyond Pesticides, May 9, 2019) On Wednesday, the U.S. Environmental Protection Agency (EPA) issued a proposed interim decision on glyphosate’s registration review, ignoring widespread scientific consensus on the herbicide’s carcinogenicity and instead restating the agency’s firm position that glyphosate is “not likely to be carcinogenic to humans.” EPA’s bold statement stands in stark contrast to scientific consensus to the contrary. In 2015, the World Health Organization’s International Agency for Research on Cancer (IARC) found glyphosate to be a probable human carcinogen. In response to resistance from the European Food Safety Authority, 94 expert scientists published an article in support of IARC’s methodologies and findings. Since 2015, several more publications have added significant weight to the body of evidence supporting glyphosate’s carcinogenicity. A February 2018 meta-analysis of studies on glyphosate suggested “a compelling link between exposures to GBH [glyphosate-based herbicides] and increased risk of NHL [non-Hodgkin lymphoma]. A February 2019 University of Washington study found that glyphosate increased the risk of non-Hodgkin lymphoma by as much as 41%. Despite attempts by current and former EPA top officials to “kill” their report, Agency for Toxic Substances and Disease Registry (ATSDR), a agency at the U.S. Department of Health and Human Services, released its […]

(Beyond Pesticides, April 8, 2019) Officials in Europe and the U.S. focus on banning problem pesticides, raising concerns about their replacements in the face of pesticide-intensive management strategies, while organic advocates call for a systems change in land management. In reference to widespread community bans of Roundup/glyphosate, Cary Gillam, author of Whitewash, told last year’s Beyond Pesticides’ Forum, “Glyphosate is the poster child for the bigger pesticide problem.” She continues, “If it goes away tomorrow, we are not okay.” Because of this, Beyond Pesticides has strategically sought to transform our country’s approach to pest management, both agricultural and residential/structural, by eliminating a reliance on pesticides and advancing organic management practices that do not rely on toxic inputs. This Daily News Blog post offers updates on progress in the European Union (EU), in the U.S. Congress, and in communities and sates nationwide. The EU is poised to ban clorothalanil, a commonly used — and highly toxic — organochlorine fungicide, The Guardian reported, in mid-to-late May 2019. After a review by the European Food Safety Authority (EFSA), EU states voted to approve a ban. EFSA identified as a chief safety concern the possibility that breakdown products (metabolites) of the compound may cause damage […]

(Beyond Pesticides, March 29, 2019) The U.S. Environmental Protection Agency (EPA) made a low-key announcement on March 19 suggesting that it may change its handling of requests from states to exert stricter controls on use of pesticides than the federal agency sets out in its registration of the compounds — by disapproving them. This is potentially a big deal because it signals that the agency will be less-kindly disposed to states’ desires to establish either somewhat different parameters of use based on local conditions and needs, or more-stringent regulations on pesticide use than those set out by federal regulators. This issue of preemption of localities’ desires to protect their populations and environment has become an increasingly dynamic frontier at the nexus of pesticide use, health, and environment. Beyond Pesticides has written more frequently about this issue in recent years as the tension between centralized, federal regulation and more-local regulation has risen; see more below. EPA appears distressed by some of the approximately 300 annual requests it gets to make some adjustment to the federal regulation. This can happen under Section 24(c) of FIFRA, which allows for a Special Local Need Label, which can be requested under a variety of conditions, including […]

(Beyond Pesticides, March 25, 2019) EPA is using a regulatory loophole – the “treated articles exemption” – to allow systemic insecticides to be used in mass quantities, without regulating or labeling them as required under the Federal Insecticide, Fungicide and Rodenticide Act (FIFRA). EPA does not currently assess adverse effects on the environment and public health caused by widespread use of neonicotinoid insecticides delivered through seeds coated with the insecticides, resulting in widespread exposure to one of the most environmentally damaging classes of chemicals on the market. Tell your Congressional delegation that EPA must fully regulate treated seeds to protect the environment and public health. Pesticide-coated seeds are now ubiquitous, yet their far-reaching impacts on wildlife and human health continue to go unregulated. The introduction and spread of seed-delivered pesticides to major field crops, beginning around 2003, caused a massive increase in total neonicotinoid use nationwide. As of 2011, 34 to 44% of soybeans and 79 to 100% of maize acres were planted with coated seeds, accounting for an astounding 35-fold increase in nationwide neonicotinoid use from baseline rates prior to 2003 (Douglas and Tooker, 2015). Alarmingly, because the national pesticide survey conducted by the National Agricultural Statistics Service fails to […]

(Beyond Pesticides, March 22, 2019) A two-year study, published March 14,  finds that field-relevant contamination with the neonicotinoid insecticide imidacloprid causes reduced body weight and metabolism in white-tailed deer, and – in fawns – mortality. Remarkably, researchers uncovered imidacloprid levels in free-ranging deer a full 3.5 times higher, on average, than the levels in the animals treated in their experiment. These new findings add to the mounting evidence of the hazards posed by current patterns of neonicotinoid use, while evidence of benefits remains sparse. The study, published in Nature Scientific Reports, includes two years of data on the physiological and behavioral outcomes of imidacloprid contamination in 80 white-tailed deer housed in a South Dakota State University captive research facility. Notably, researchers were unable to entirely control imidacloprid levels in untreated deer, most likely due to background contamination from corn- and soy-based feed, and surrounding vegetation infiltrated by runoff from nearby agricultural fields. This background contamination altered, but did not compromise, the analysis. Researchers found that imidacloprid levels detected in the spleens of treated and control animals were significantly predictive of reduced thyroid hormone levels, shorter jawbones, lower activity levels, and higher fawn mortality. Lead authors Elise Berheim, Jonathan Jenks, PhD, […]

(Beyond Pesticides, March 17, 2019) Forget about single-pesticide issues: this affects every single one of them. EPA is allowing massive data gaps to persist for each and every pesticide product it registers by conducting the bulk of its health and environmental risk assessments using active ingredients alone. With its current practices, EPA is failing its federal mandate to protect public health and the environment and misleading the public about what is “safe.” Tell your Congressional delegation that EPA must assess the real risks of pesticide use, not rely on false representations of risk based on tests of isolated ingredients. When pesticides are sprayed on our crops, lawns, and roadsides, and enter into our waterways, groundwater and drinking water, we are exposed to whole formulations, whole tank mixtures, and whole pesticide combinations, not just active ingredients (those that the manufacturer claims are the only ingredients that attack the target pest). It is the whole formulation that makes the poison, and that whole formulation must be regulated. Active ingredients are far from the whole story of pesticide poisoning. Despite their name, “inert” ingredients are very often not chemically, biologically, nor toxicologically inert or innocuous. According to a peer-reviewed study, as of 2006, more […]

(Beyond Pesticides, March 11, 2019)  We must stop the expanded commercialization of genetically engineered pesticides. The failure of the U.S. Environmental Protection Agency (EPA) to fully evaluate environmental impacts of gene-manipulating pesticides raises serious concerns in light of the agency’s ongoing failure to predict ecological effects of pesticides, such as the dramatic decline of pollinators. With the release of a 2019 peer-reviewed scientific article, Environmental Fate of RNA Interference Pesticides: Adsorption and Degradation of Double-Stranded RNA Molecules in Agricultural Soils, on the potential impact on soil and non-target microorganisms in soil, the study’s co-author, Kimberly Parker, PhD, remarked, “The ecological risk assessment of these emerging pesticides necessitates an understanding of the fate of dsRNA [double stranded RNA] molecules in receiving environments, among which agricultural soils are most important.” This technology, given that it is systemic to the plant and leaves traces in the soil, can cause widespread indiscriminate poisoning—as has been seen with bees, butterflies, birds, and the larger catastrophic decline of insect populations. Tell your members of Congress that the ecological effects of RNAi gene-manipulating pesticides raise serious questions—they have not been fully studied by EPA and, until they are, the agency should issue a moratorium on their release. Previously, […]

(Beyond Pesticides, March 8, 2019) Researchers from the U.S. and Switzerland have published their findings, a beginning assessment of how use of a new category of pesticides — dsRNA (double stranded RNA), which is less a traditional pesticide than a genetically based pesticide “technology” — might impact soils and non-target microorganisms in the soil. The co-authors (Kimberly M. Parker, PhD, et al.) note that, “The ecological risk assessment of these emerging pesticides necessitates an understanding of the fate of dsRNA molecules in receiving environments, among which agricultural soils are most important.” Their research appeared in late January 2019 in Environmental Science & Technology. Previously, technical hurdles in measuring dsRNA had stymied scientists’ ability to quantify the genetic material and its degradation products in soil, but these investigators were able to attach a radioactive atom to the molecule, “tagging” it so it could be followed through a series of simulated soil systems representative of those in the “real” world. Researchers were able to measure the presence of the material at concentrations as low as a few nanograms of dsRNA per gram of soil. The work of these researchers represents the beginning of understanding the ecological risks of these emerging dsRNA pesticides. They demonstrated […]

(Beyond Pesticides, March 5, 2019) Wild, edible plants subject to drift from the herbicide glyphosate during forestry operations can be contaminated with the chemical an entire year after an initial application, according to a new study published in the Canadian Journal of Forest Research. Glyphosate is often used in forestry to knock down unwanted trees, shrubs, and other plants after clear-cutting to provide room for the regrowth of trees deemed valuable. However, this new research shows that “non-target” species, such as raspberries and blueberries, eaten by wildlife and sometimes wild foraged by humans can retain significant levels of glyphosate contamination due to drift and overspray. Forester Lisa Wood, PhD, from the University of Northern British Columbia began this research based on input and requests from Canadian indigenous First Nations communities. Back in 2013, shrubs foraged by traditional berry-pickers in northeastern British Columbia were sampled and found to contain glyphosate residues, leading to the need for a broader investigation. Dr. Wood sampled the roots and shoots of 10 plant species from an area that had been aerially sprayed with glyphosate a year prior as part of forestry operations to clear aspen and make room for coniferous re-plantings. The 10 plants, which […]

(Beyond Pesticides, March 4, 2019) Last week, U.S. Representative Earl Blumenauer (D-OR) reintroduced the Saving America’s Pollinators Act (H.R.1337) to cancel specific bee-toxic pesticides and establish a review and cancellation process for all pesticides that are potentially harmful to pollinators. The specific pesticides targeted in the bill include the systemic insecticides imidacloprid, clothianidin, thiamethoxam, dinotefuran, acetamiprid, sulfoxaflor, flupyradifurone, and fipronil. The bill also establishes requirements for review of other potentially bee-toxic chemicals by an independent pollinator protection board, and requires annual reports on the health and population status of pollinators. The bill creates a sustainable model for pollinator protection in the face of ongoing obstruction by an increasingly industry-influenced EPA. There are 29 cosponsors to date. The current bill is the fifth version of Saving America’s Pollinators Act (SAPA), which was first introduced by U.S. Representative Conyers (D-MI) in 2013. The newest version differs from previous bills in its bold definition of who should have responsibility for assessing harm to pollinators. SAPA 2019 calls for the establishment of a Pollinator Protection Board, to be composed of expert scientists, beekeepers, farmers, members of environmental organizations and other key stakeholders, nearly all of whom must not have any conflict of interest or affiliation […]

(Beyond Pesticides, February 28, 2019) Earlier this month, a team of U.S. scientists published a meta-analysis of studies on glyphosate-based herbicides (GBH), concluding that the evidence “suggests a compelling link between exposures to GBH and increased risk of NHL [non-Hodgkin lymphoma],” corroborating findings by the International Agency for Research on Cancer. The analysis, authored by researchers from University of California, Berkeley, University of Washington, Seattle, and the Icahn School of Medicine at Mount Sinai, New York, is the latest to support the conclusions established by the International Agency for Research on Cancer that products containing glyphosate pose a cancer risk to humans. As research continues to accumulate on the risks posed by this chemical, the case for transitioning to less toxic alternatives to safeguard public health is becoming increasingly urgent. Researchers took every available published human study on NHL and glyphosate, including the most recently updated data from the ongoing U.S. Agricultural Health Study (AHS), in conducting their review. Focus was put on individuals within these studies exposed to the highest amounts of glyphosate. The reasoning, researchers indicate, is that if there is a true association between glyphosate and a health outcome like cancer, exposures to higher amounts for a longer […]

(Beyond Pesticides, February 5, 2019) Linuron, an herbicide registered for use by the U.S. Environmental Protection Agency (EPA), yet recently banned in Europe due to health concerns, appears to trigger inflammatory signals that have been linked to the onset of Multiple Sclerosis (MS). This new evidence, published in the journal Cell by researchers at Brigham and Women’s Hospital in Boston, MA, indicates that exposure to chemicals and pesticides in the environment may be a risk factor in the development of neurodegenerative diseases. “We created a platform to systematically investigate the understudied effects of environmental exposures,” said study coauthor Francisco Quintana, PhD. “The goal of our work is to return results that can guide future epidemiological studies and identify actionable targets.” Researchers began their investigation with 976 chemicals identified by EPA’s ToxCast program, an inventory of compounds that have undergone screening for a battery of laboratory tests. Within that inventory, 75 chemicals, including linuron, were found to interfere with the signaling pathways linked to MS. To confirm the adverse impacts, scientists used the embryos of zebrafish, animals often used as models in laboratory research. The zebrafish embryos were altered to contain low levels of myelin, a protein that protects nerve cells, as […]