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At about 7 days seven in utero, the sexual intercourse-linked gene about the Y chromosome initiates the development from the testicles in male infants. The testicles generate testosterone.在青春期时，睾酮会令孩童出现第一种雄激素上升可见的现象。这些现象包括：[来源请求]层次（鞘膜 · 白膜 · 血管膜