The immunolocalization of P450c17 and P450arom in the ovary of wild female ground squirrels. The immunolocalization of P450c17 (a, b, c) and P450arom (d, e, f) in the ovary of wild female ground squirrels during the breeding and nonbreediang seasons. The breeding season divided into two stages, the large follicle stage (a, d) and the small follicle (b, e). g, negative control. IC, interstitial cell; TC, theca cell; GC, granulosa cell. Bars =50μm.