in competition experiments the b50 progesterone values ( nm ) were : p ( 2 ) , 20 alpha-dihydroprogesterone ( 12 ) , 20 beta-dihydroprogesterone ( 25 ) , estradiol ( 158 ) , testosterone ( 675 ) and corticosterone ( greater than 1,000 ) .
C0033308
progesterone
C0012311
20 alpha-dihydroprogesterone