Fig. 1From: Does metformin improve in vitro maturation and ultrastructure of oocytes retrieved from estradiol valerate polycystic ovary syndrome-induced ratsCumulus oocyte complex expansion, (a) expanded COCs, cultured for 48 h in the presence of metformin in PCOS- induced (400×); (b) Non-expanded COCs, cultured for 24 h in the absence of metformin from the control rats (200×). ZP, zona pellucida; Oo, oocyteBack to article page