steroidogenic acute regulatory protein
Using reverse transcription quantitative real-time PCR, this study examined testicular mRNA levels of CYP11A1 (P450 cholesterol side-chain cleavage enzyme, P450scc), CYP17A1 (P450 17a-hydroxylase/C17-20 lyase, P450c17), HSD3B2 (3b-hydroxysteroid dehydrogenase, 3b-HSD), CYP19A (P450 aromatase, P450arom), STAR (steroidogenic acute regulatory protein, StAR), cyclooxygenase (COX) -1 and COX-2 in prepubertal (4-6  months of age), postpubertal (1  year of age), and aging (2-18  years of age) dogs.