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Growth (log transformation of percent diameter increase compared to Day 0 defined as onset of culture) ± SEM of preantral, early antral, and antral stage dog ovarian follicles cultured in vitro with various activin (0, 100, or 200 ng/ml) and FSH (0, 0.1, 1, or 10 μg/ml) concentrations. Values with differing letters within the same follicle stage, FSH treatment, and culture day represent differences (P < 0.05) among activin concentration groups.
