Page "Spermatozoon" Paragraph 23

Approaching the egg cell is a rather complex, multistep process of chemotaxis guided by different chemical substances / stimuli on individual levels of phylogeny.

One of the most significant, common signaling character of the event is that a prototype of professional chemotaxis receptors, formyl peptide receptor ( 60. 000 receptor / cell ) as well as the activator ability of its ligand formyl Met-Leu-Phe have been demonstrated in the surface membrane even in the case of human sperms.