<unk>  (also<unk> -OH-pregnenolone and <unk> , is a C21 steroid that is obtained by hydroxylation of pregnenolone at the C17α position.  This step is performed by the mitochondrial cytochrome P450 enzyme<unk> α-hydroxylase (CYP17A1)  that is present in the adrenal and gonads. Peak levels are reached in humans at the end of puberty and then decline. High levels are also achieved during pregnancy.
17-Hydroxypregnenolone
17-Hydroxyprogesterone
Dihydrotestosterone
Methyltestosterone
Desoxymethyltestosterone
Dehydroepiandrosterone
Testolactone
Ethinylestradiol