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Consider it to be the mature spermatozoon’s crash-helmet, present over the sperm head until the successful sperm binds to the coating of the egg known as the zona pellucida; imagine it to be like a balloon into which your fist is pushed (the fist being the sperm’s head) - bursting only when bound like Velcro to the zona (see acrosome reaction).
Copyright © 1998 Robert
Jansen, WH Freeman / Scientific American Books, and Allen &
Unwin. |
