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Effect of activin on antrum formation and granulosa cell death on Day 6 of culture. Values are mean ± SEM.
| Treatment | % Follicles with Antrum | % Granulosa Cell Death |
| Control (n = 25) | 25.0 | 1.4 ± 0.4 |
| Activin A (10 ng/ml) (n = 25) | 47.4 | 0.5 ± 0.1 |
| Activin A (100 ng/ml) (n = 25) | 33.3 | 2.5 ± 1.1 |
