Cortical granule distribution in prepubertal (a) and adult (b) ovine cumulus-oocyte-complexes (COCs) after 24 hours of IVM. Representative TEM micrograph showing a discontinuous cortical granule (CG) distribution under the oolemma, with area devoid of CGs (a) and a continuous monolayer of CGs (b). CC: a cumulus cell. Bar in a): 1 μm. Bar in b): 2 μm.