Microphotographs showing apoptosis in granulosa cells of ovarian antral follicles using MB staining after PGE2 treatment at 1.0 μg/ml (D, E, F) and PGF2α treatment at 1.0 μg/ml (G, H, I) in comparison with control (A, B, C) depicting apoptotic granulosa cells with blue color and normal live cells with no color after 24 h culture at ×400