after in vitro incubation with a nadph generating system , which under the conditions used was a much stronger stimulus for steroid biosynthesis than hcg or dibutyryl camp , the tissue of young rats produced about twice the amount of testosterone precursors ( pregnenolone , progesterone , 17alpha-hydroxyprogesterone and androstenedione ) than old tissue .
C0033308
progesterone
C0020387
17alpha-hydroxyprogesterone