Interstitial cells are testosterone-producing cells in both the male and female reproductive system. In males, they are found in the testes, are responsible for some 95% of testosterone production, and are often referred to as Leydig cells. In females, the interstitial cells produce about 50% of all testosterone and are located in the ovaries.

For more information, see Testosterone, the Male Urogenital System and the Female Urogenital System.

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