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In a paper appearing in this week's Early Edition, researchers at Johns Hopkins University School of Medicine and at the University of California, Irvine, show that deletion of Lhx2 in aging mice induces constitutive reactive gliosis, which then reduces "rates of ongoing apoptosis and compromised both rod and cone photoreceptor function." The Hopkins-Irvine team adds that these animals also "showed a dramatically reduced ability to induce expression of secreted neuroprotective factors and displayed enhanced rates of apoptosis in light-damage assays." Overall, the researchers say their study

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NPR reports that researchers have developed chimeric embryos as part of work toward growing human organs in animals for organ transplants.

According to the Washington Post, the Biden Administration is set to make changes to federal restrictions on fetal tissue research.

In Science this week: approach to isolated trace DNA from archaic humans from sediments, and more.

Texas Monthly looks into the DNA Zoo being collected by Baylor College of Medicine researchers.