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 in the past, with human cells implanted into sheep and pig embryos.
The scientists were led by Prof Juan Carlos Izpisua Belmonte of the Salk Institute in the US, who, in 2017, helped make the first human-pig hybrid.
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