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At all around 7 days seven in utero, the sex-relevant gene around the Y chromosome initiates the development of your testicles in male infants. The testicles make testosterone.层次（鞘膜 · 白膜 · 血管膜） · 附件 · 纵隔 · 小叶 · 隔片 · 莱迪希细胞 · 塞尔托利氏细胞 · 血睾屏障男性的第二性征�