Researchers generate human-monkey chimeric embryos

Investigators in China and the United States have injected human stem cells into primate embryos and were able to grow chimeric embryos for a significant period of timeā€”up to 20 days. The research, despite its ethical concerns, ...

Groups urge pressure on Mexico to save tiny vaquita porpoise

Environmental groups called Thursday for an international ban on trade in a range of Mexican seafood and wildlife, seeking to force Mexico to do more to save the vaquita marina porpoise, the world's most endangered marine ...

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