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Development of the Reproductive Systems
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Description
Mullerian-inhibiting substance (MIS) causes apoptosis of cells in the Mullerian ducts in developing males. So, no structures develop from the ducts in male reproductive systems.
Testosterone in developing males secreted by interstitial cells in the testes stimulates the development of the mesonephric ducts into the epididymis, vas deferens, ejaculatory duct and seminal vesicles.

Before differentiation, all embryos have:
Urethral (urogenital) folds
Urethral groove
Genital tubercle
Labioscrotal swelling
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