Anti-protein tyrosine phosphatase non-receptor type 4 antibodies are used for the immunodetection of the protein encoded by the PTPN4 gene. In humans, the canonical protein has a reported length of 926 amino acid residues and a mass of 105.9 kDa. Its subcellular localization is in the cell membrane and cytoplasm. A member of the Protein-tyrosine phosphatase protein family, it is a reported phosphatase that plays a role in immunity, learning, synaptic plasticity or cell homeostasis. Post-translational modifications have been described, including protein cleavage and phosphorylation. Other names for this target antigen include PTPMEG, PTPMEG1, tyrosine-protein phosphatase non-receptor type 4, PTPase-MEG1, megakaryocyte phosphatase, and MEG. Gene orthologs have been identified in the mouse, rat, bovine, frog, zebrafish, chimpanzee and chicken species.