Between the (Gender) Lines: the Science of Transgender Identity
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Summary:
Sex determination – the way we are “coded” into a biological sex – is complicated in and of itself. There are far more options than just “male” or “female,” and countless instances of species that can actually transition from one sex to another within a single lifetime. With most mammals, however, the majority of individuals are cisgender male or female; transgender individuals are estimated to comprise about 0.3% of the adult U.S. population.
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