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Genital development (human). (A) During early development, the gut is separated from what becomes a UGS by the growing urorectal septum, and subsequently the two separate orifices form. Phallus will develop ventrally from UGS. (B) External genitalia formation at the undifferentiated stage on the left and differentiated (female) stage on the right. Figures inspired by Carlson (2014).
