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Fertilisation and polyspermy block.
Diagram showing steps of fertilization and slow block to polyspermy, unlabeled.
© Alila Medical Media
Image size: 17.5 Mpixels (50.1 MB uncompressed) - 5000x3500 pixels (16.7x11.7 in / 42.3x29.6 cm at 300 ppi)