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New research suggests that placozoans, amoeba-like, multicelled organisms, are ancestors to sea sponges, thought to be the most ancient ancestor of all animals, says a blog post at Discover magazine. In work published this week, scientists performed molecular phylogenetic analysis of animals from 24 taxa, generating a new tree of life that placed placozoans, sponges, and jellyfish on one line and more complex animals on another.

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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.