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Kraken
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“Females do not secrete hormones after birth. Without the conversion of this testosterone burst into estrogen, much of male mouse brain circuitry develops similarly to normal female mice. Female mice provided with a shot of either testosterone or estrogen shortly after birth became “masculinized.””
Estrogen Plays Key Role in Male Brain Development
Not testosterone, but rather estrogen, the “female” hormone, is most directly responsible for the development of brain circuits in males that guide aggressive and territorial behaviors – at least in mice.
www.ucsf.edu