Peptide sequence: MSTSRKLKSH GMRRSKSRSP HKGVKRGGSK RKYRKGNLKS RKRGDDANRN Sequence homology: Cow: 92%; Dog: 100%; Guinea Pig: 92%; Horse: 100%; Human: 100%; Mouse: 100%; Pig: 100%; Rabbit: 100%; Rat: 100%; Sheep: 92%. TNP1 is a spermatid-specific product