aliquots of the incubation media were removed at intervals and analysed for the steroids 17alpha , 20beta-dihydroxy-4-pregnen-3-one ( 17alpha20betap ) , 17alpha-hydroxyprogesterone , progesterone , androstenedione , testosterone and oestradiol .
C0020387
17alpha-hydroxyprogesterone
C0033308
progesterone