• sperm cells
  • I don't know of any documented cases of people born after polyspermy - having chromosomes from two sperm cells plus the egg would result in triploidy (having 3 copies of each chromosome rather than the normal 2 copies of each), which is an embryonic lethal condition, resulting in miscarriage or stillbirth. (gatech.edu)
  • role
  • One additional mechanism that may be important in producing lowered fertility is that VGCC activation and consequent high [Ca2+]i levels is known to have a key role in AVOIDING polyspermy. (jackkruse.com)