The 40 female kunming minor mice were divided randomly into 3 treatment groups and 1 control group with 10 each,The 3 treatment groups were injected intraperitoneal with 10,20 and 40 mg of lead per kilogram of body weight for 2 days,respectively,and the control group injected with the same volume of normal saline as the 3 treatment groups.The apoptosis rates of granulosa cells were detected by the TdT-mediated dUTP-biotin nick end Labeling（TUNEL） technique and preparation of paraffin section on day 1 and 3 post-injection respectively,meanwhil...
