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Male and female mouse external genitalia are similar morphologically and morphometrically at birth but achieve dramatic differences by age 21 days, suggesting that a significant portion of sexual differentiation in the mouse occurs after birth. We described these changes using novel, accurate morphometric measurements and 3-dimensional reconstruction. These results will be useful for studying abnormal sexual development of the mouse external genitalia.
Schlomer et al. (Thu,) studied this question.