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3 beta Hydroxy delta 5 Steroid Dehydrogenase

An enzyme that catalyzes the reduction of a 3 beta-hydroxy-delta(5)-steroid to 3-oxo-delta(4)-steroid in the presence of NAD. It converts Pregnenolone to Progesterone and Dehydroepiandrosterone to Androstenedione. EC 1.1.1.145.