Synonyms:ADAM 2, ADAM metallopeptidase domain 2, ADAM2, Cancer/testis antigen 15, CRYN1, CRYN2, CT15, Fertilin subunit beta, FTNB, PH 30, PH 30b, PH30, PH30 beta Background:Sperm surface membrane protein that may be involved in sperm-egg plasma membrane adhesion and fusion during fertilization. Could have a direct role in sperm-zona binding or migration of sperm from the uterus into the oviduct. Interactions with egg membrane could be mediated via binding between its disintegrin-like domain to one or more integrins receptors on the egg. This is a non catalytic metalloprotease-like protein.