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Dark area and lipid droplets in bovine oocytes [21]. A: Denuded oocytes having dark clusters in ooplasm. B: Oocyte at germinal vesicle stage has clusters of lipid droplets and mitochondria (surrounded by whit arrowheads). C: Many lipid droplets (asterisks) existed in ooplasm, and they are surrounded by mitochondria (white arrowheads).
