part of start stage end stage oocyte ovarian follicle stage III oocyte stage III postvitellogenic oocyte oocytes stage III TAO:0001566 ZFA:0001566 Stage 3 oocyte In stage III (vitellogenesis), yolk proteins appear in oocytes and yolk bodies with crystalline yolk accrue during this major growth stage. Oocytes develop the capacity to respond in vitro to the steroid 17, 20-dihydroxy-4-pregnen-3-one (DHP) by undergoing oocyte maturation ZDB-PUB-961014-1020. vitellogenic oocytes zebrafish_anatomy Oocyte part of stage III ovarian follicle. Stage III oocytes contain internal vitellus droplets and peripheral yolk vesicles. juvenile:days 45-89 adult