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A 3-beta-hydroxy-Delta(5)-steroid + NAD = a 3-oxo-Delta(5)-steroid + NADH
A 3-beta-hydroxy-Delta(5)-steroid+Thumb=a 3-oxo-Delta(5)-steroid+Thumb

Enzymes

  1. 3 beta-hydroxysteroid dehydrogenase/Delta 5-->4-isomerase type 2