Anti-protamine 1 antibodies are used for the immunodetection of the protein encoded by the PRM1 gene. In humans, the canonical protein has a reported length of 51 amino acid residues and a mass of 6.8 kDa. Its subcellular localization is in the nucleus and chromosomes. It is notably expressed in the testis. A member of the Protamine P1 protein family, it is known to be involved with spermatogenesis. Post-translational modifications have been described, including phosphorylation. Other names for this target antigen include P1, sperm protamine P1, cancer/testis antigen family 94, member 1, cysteine-rich protamine, testicular tissue protein Li 91, and CT94.1. Gene orthologs have been identified in the mouse, rat, bovine and chimpanzee species. A number of protamine 1 antibodies have been mentioned in research publications and have associated citations. Western Blot, Immunofluorescence, and Immunohistochemistry are common applications for these antibodies.