Anti-SPINT4 antibodies are used in the immunodetection of the protein serine peptidase inhibitor, Kunitz type 4. In humans, the canonical protein has a reported length of 99 amino acid residues and a mass of 11.4 kDa. It has been described to be a secreted protein. It is notably expressed in the epididymis. Synonyms for this target antigen include epididymis secretory sperm binding protein, serine protease inhibitor, Kunitz type 1, serine protease inhibitor, Kunitz type 4, and kunitz-type protease inhibitor 4. SPINT4 gene orthologs have been reported in the chimpanzee and chicken species. Indicated applications for SPINT4 antibodies listed below include Immunohistochemistry.