Western blotting of FSHR, LHR, P450c17, P450arom, AR and ERs in the ovary of wild ground squirrels. The expression levels of FSHR (a), LHR (b), P450c17 (c), P450arom (d), AR (e), ERa (f) and ERb (g) were analyzed by optical density in the ovary of wild ground squirrels. The proteins were extracted from the whole ovary of the breeding season (lane 1), nonbreeding season (lane 2). b-actin (h) was used for endogenous control. The analysis of optical density of FSHR, LHR, P450c17, P450arom, AR, ERa and ERb were shown in histogram a’-g’, respectively. Data are shown as the mean ± SEM. *: p < 0.05, **: p < 0.01, ***: p < 0.001.