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At about 7 days 7 in utero, the sex-related gene over the Y chromosome initiates the development with the testicles in male infants. The testicles develop testosterone.肾上腺髓质： 肾上腺素、去甲肾上腺素 － 肾上腺皮质： 醛固酮、皮质醇、脱氢表雄酮In human beings, masculinization of the fetal brain appears, by o