Anti-serine protease 55 antibodies are used for the immunodetection of the protein encoded by the PRSS55 gene. In humans, the canonical protein has a reported length of 352 amino acid residues and a mass of 38.9 kDa. Its subcellular localization is in the cell membrane and cytoplasm. Alternative splicing is reported to yield 2 different isoforms for this protein. A member of the Peptidase S1 protein family, it is a suspected serine protease, which plays a crucial role in the fertility of male mice including sperm migration and sperm-egg interaction. Post-translational modifications have been described, including glycosylation. Other names for this target antigen include protease, serine 55, testis serine protease 1, tryptophan/serine protease, and probable serine protease UNQ9391/PRO34284. Gene orthologs have been identified in the mouse, rat, bovine and chicken species. Some serine protease 55 antibodies may have been used in research and have associated citations. Western Blot is a widely used application for these antibodies. Immunocytochemistry and Immunofluorescence are also common applications.