testosterone and the testosterone precursors pregnenolone , progesterone , 17 alpha-hydroxyprogesterone , 17 alpha-hydroxypregnenolone , androstenedione , androstenediol and dehydroepiandrosterone were measured in the spermatic vein plasma and in the testicular tissue of young and old men .
C0373704
pregnenolone
C0376260
17 alpha-hydroxypregnenolone