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Published online 21 October 2003 | Nature | doi:10.1038/news031020-1
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Embryo brain shows sex signs early
Genetic discrepancies between males and females measured mid-term.
Genes drive the brains of male and female embryos apart as early as midway through gestation, a new study suggests1. These gender differences were assumed to arise around birth due to hormones pumped out by males' budding testes.
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