Sperm chemotaxis.

@article{Eisenbach1999SpermC,
  title={Sperm chemotaxis.},
  author={Michael Eisenbach},
  journal={Reviews of reproduction},
  year={1999},
  volume={4 1},
  pages={56-66}
}
Communication between spermatozoa and egg before contact by chemotaxis appears to be prevalent throughout the animal kingdom. In non-mammalian species, sperm chemotaxis to factors secreted from the egg is well documented. In mammals, sperm chemotaxis to follicular factors in vitro has been established in humans and mice. The attractants of female origin in non-mammalian species are heat-stable peptides or proteins of various sizes, or other small molecules, depending on the species. Species… CONTINUE READING