https://english.elpais.com/science-tech/2025-06-04/for-the-first-time-an-external-factor-turns-a-male-mammal-into-a-female.html
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For the first time, an external factor turns a male mammal into a female - EL PAÍS English
6/4/25 at 4:39pm
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EL PAÍS
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Nuño Domínguez
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An experiment in mice has discovered that a mother’s iron deficiency alters sex determination. Until now, it was believed that only genetics defined this biological trait
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