Peptide sequence: TTSVPVLPNS CPLDVSHAIC SIGDSKVFVC GGVTTASDVQ TKDYTINPNA Sequence homology: Cow: 100%; Dog: 100%; Guinea Pig: 86%; Horse: 93%; Human: 100%; Mouse: 100%; Pig: 100%; Rabbit: 100%; Rat: 100%. CCIN is a basic protein of the sperm head cytoske