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Representative photographs of mouse preantral follicles (from 14-day old mouse) cultured in vitro for 12 days. The cultured isolated follicle on day 2 (a), day 4 (b), day 6 (c), day 8 (d), day 10 (e) and The oocyte ovulated of cultured preantral follicle after hCG administration (f). Antral-like cavities are indicated by black arrow
