under all experimental conditions , 20 alpha-hydroxysteroid dehydrogenase activity was identified only in the 105,000 g placental cytosol : intact , osmotically ruptured , and acetone-extracted mitochondria , nuclei , and microsomes did not convert progesterone to 20 alpha-dihydroprogesterone .
C0033308
progesterone
C0012311
20 alpha-dihydroprogesterone