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Monkey embryos containing human cells have been made in a laboratory, a study has confirmed.

The research, by a US-Chinese team, has sparked fresh debate into the ethics of such experiments.

The scientists injected human stem cells – cells that have the ability to develop into many different body tissues – into macaque embryos.

The developing embryos were studied for up to 20 days.

Other so-called mixed-species embryos, or chimeras, have been produced

This post was originally posted on BBC News. Read the rest of the story at https://www.bbc.co.uk/news/science-environment-56767517.

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