Fig. 3

Light micrographs of oocytes cultured for, (a) 12 h in the absence of metformin in the normal; (b) 24 h in the absence of metformin in the PCOS-induced; (c) 36 h in the presence of metformin in the PCOS-induced rats. Few atretic and dark small cumulus cells noticed in (c). Resinate 1 μm-sections, toluidine blue staining (400×). ZP, zona pellucida; Oo, oocyte; CC, cumulus cells