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The fate of spermatozoa that reached ZP surface
| No. of spermatozoa (%) |
||
| Spermatozoa | Acrosome-reacted before contact with ZP | Acrosome-intact when first contacted with ZP |
| Entered the cumulus and reached ZP surface | 115 | 214 |
| Initiated the AR on ZP | — | 4 (1.9) |
| Penetrated through ZP | 57 (49.6) | 4 (1.9) |
| Developed to sperm pronucleus | 12 (10.4) | 1 (0.5) |
