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William Hurlbut, who has been in contact with He earlier this year, refused to say when he last heard from him.A Chinese investigation seemed to confirm the existence of the two babies, both girls.The report said they and people involved in a second pregnancy using a gene-edited embryo would be closely watched by government health agencies.Nothing has been said about the third possible baby, which should have been born in late summer.Chinese officials have seized the remaining edited embryos and records from He's laboratory."He caused unintended consequences in these twins," Musunuru said of the gene editing."We don't know if it's harming the kids."Who Helped He?It is unclear who else may have helped He Jiankui in his research.Rice University in Texas said it is still investigating the actions of Michael Deem, whose name was on a paper He sent to a scientific publication.Deem served as He's adviser when he attended Rice years ago.The AP and others have reported on other scientists in China and the United States who knew or strongly suspected what He was doing."Many people knew, many people encouraged him.He did not do this in a corner," Hurlbut said.Scientists are investigating a massive die-off of mussels in a major river in the southeastern United States.They hope to learn the cause.In 2016, fish and wildlife officials discovered a big drop in the mussel population in the Clinch River.The river flows about 480 kilometers through the states of Virginia and Tennessee.It is home to many different kinds of fish and 46 species of mussels.While freshwater mussels are small, they perform some important activities to keep rivers healthy.Mussels can clean up up to 38 liters of river water each day, removing algae, metals and other materials.The process can create a better river environment for fish, amphibians, plants and insects.For this reason, scientists are working to find the cause of the large drop in mussel populations.Jordan Richard is a biologist with the U.S. Fish and Wildlife Service.He told The Associated Press that officials have estimated that hundreds of thousands, possibly even millions, of mussels have died in the Clinch River.The mass die-off in the river of one kind of mussel, called the pheasantshell, has been especially worrisome.Officials say the population of pheasantshells dropped from 94,000 in 2016 to less than 14,000 in 2019.They measured the decrease along a 200-meter stretch of the Clinch River.Similar die-offs have been reported on at least five U.S. rivers and another in Spain.Richard has studied reports of similar die-offs over the years in rivers around the world.

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