Chinese scientists have created mice with genetic material from two males that survived to adulthood, marking a potential breakthrough in reproductive biology, according to research published in Cell Stem Cell. Researchers at the Chinese Academy of Sciences used CRISPR gene editing to target 20 genes involved in embryonic development, producing seven live pups from 164 embryos. The surviving mice grew larger than normal, had enlarged organs, were infertile and had shorter lifespans.

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