![]() Furthermore, 5alpha-reductase, the enzyme that converts testosterone to dihydrotestosterone, exhibits apparent similar substrate specificity in control foreskin fibroblasts and in the foreskin itself. Under the standardized conditions utilized in this study, the rate of dihydrotestosterone formation was greater in fibroblasts grown from genital skin (foreskin and scrotum) passages exhibit the same differentiation in dihydrotestosterone formation as the skin from which the fibroblasts were grown. The conversion of testosterone to dihydrotestosterone has been assessed in fibroblast monolayers grown from skin biopsies of foreskin, scrotum, and various nongential skins from 31 control men who varied in age from newborn to 25 years and three 46,XY subjects with hereditary male pseudohermaphroditism.
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