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Chimeric Human-Monkey Embryos Kept Alive for a Record 19 Days A chimeric human-monkey blastocyst. Building on previous experiments, an international team of scientists has created chimeric human-monkey embryos, which were kept alive for nearly three weeks. The breakthrough could lead to new ways of testing drugs and generating organs for transplant, but this line of research is raising some ethical concerns. Advertisement New research in Cell details the experiment, in which human stem cells were injected into primate embryos belonging to macaque monkeys. Most of these chimeric embryos were dead by the 10th day, but several developed for 19 days. Juan Carlos Izpisua Belmonte, the lead author of the new study and a biologist at the Salk Institute, had previously kept human-monkey chimeric embryos alive for 14 days.

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