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3alfa-Hydroxysteroid Dehydrogenase is an enzyme crucial in steroid metabolism. It catalyzes the reversible conversion between 3alfa-Hydroxysteroids and 3-ketosteroids, utilizing NAD(P)+ or NAD(P)H as cofactors. The enzyme efficiently processes substrates such as 3alfa-tetrahydroprogesterone (allopregnanolone) and 3alfa-androstanediol, converting them into dihydroprogesterone and dihydrotestosterone, respectively.