Plays a role in fertilization by controlling binding of sperm to zona pellucida and migration of spermatozoa into the oviduct (By similarity). May play a role in signal transduction and promote protein tyrosine phosphorylation (By similarity).
Cell membrane ; Lipid-anchor, GPI-anchor . Membrane raft . Cytoplasmic vesicle, secretory vesicle, acrosome . Secreted . Cytoplasmic vesicle . Located on plasma membrane of spermatocytes, round and elongated spermatids, and testicular spermatozoa. .
Detected in testis and spermatogonia. Not detected in spermatocytes. Detected in blood leukocytes.
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