the activity of 20 alpha-hsd was measured by the conversion rate of 14c-progesterone to 14c-20 alpha-hydroxy-4-pregnen-3-one , hcg apparently stimulated the 3 beta-hsd activity both in vivo and in vitro .
C0033308
progesterone
C0012311
20 alpha-hydroxy-4-pregnen-3-one