Early embryo cells can develop either into specialized body cells or into precursors of eggs or sperm. It is not understood how this crucial decision is made in mammals, but new work brings us closer to the answer.
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Hogan, B. Decisions, decisions!. Nature 418, 282–283 (2002). https://doi.org/10.1038/418282a
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DOI: https://doi.org/10.1038/418282a
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