Figure 27. Steroidogenesis. Grey boxes indicate steps taking place both in adrenals and gonads red boxes, gonadal-specific steps. DHT: Dihydrotestosterone; HSD: hydroxy-steroid dehydrogenase; P450aro: Cytochrome P450 aromatase; P450c17: Cytochrome P450 17 alfa-hydroxylase/17-20 desmolase; P450scc: Cytochrome P450 side-chain cleavage; StAR: Steroid acute regulatory protein.