Anti-TNP1 antibodies are used in the immunodetection of the protein transition protein 1. In humans, the canonical protein has a reported length of 55 amino acid residues and a mass of 6.4 kDa. Its subcellular localization is in the nucleus. It is noted to be expressed by spermatids. A member of the Nuclear transition protein 1 protein family, TNP1 is known to play an important role in the replacement of histones to protamine in the elongating spermatids of mammals. Synonyms for this target antigen include spermatid nuclear transition protein 1, STP-1, TP-1, transition protein 1 (during histone to protamine replacement), and TP1. TNP1 gene orthologs have been reported in the mouse, rat, bovine and chimpanzee species. A number of TNP1 antibodies have been mentioned in research publications and have associated citations. Western Blot is a widely used application for these antibodies. ELISA, Immunofluorescence, and Immunohistochemistry are also common applications.