While the research holds promise for organ transplants, studying disease and testing new drugs, it also prompts controversy.
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Scientists create first human-monkey embryo
In this monkey-human embryo, human cells glow in red. [Image courtesy of Weizhi Ji / Kunming University of Science and Technology]A group of scientists from the U.S. and China injected human stem cells into 132 macaque embryos, which then developed for up to 20 days.
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