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Oocyte diameters measured on Day 0, and in Day 6 cultured control follicles and follicles treated with activin A. Values are mean ± SEM. Oocyte diameter increased from Day 0 to Day 6 in all culture groups (p < 0.05). Activin A, at a concentration of 100 ng/ml, increased oocyte diameter over control levels on Day 6 of culture (p < 0.05).
