Anti-MPP1 antibodies are used in the immunodetection of the protein MAGUK p55 scaffold protein 1. In humans, the canonical protein has a reported length of 466 amino acid residues and a mass of 52.3 kDa. Its subcellular localization is in the cell membrane. Alternative splicing is reported to yield 3 different isoforms for this protein. It is ubiquitously expressed across many tissue types. A member of a the MAGUK protein family, MPP1 is a reported essential regulator of neutrophil polarity. Post-translational modifications have been described, including palmitoylation. Synonyms for this target antigen include DXS552E, EMP55, MRG1, PEMP, 55 kDa erythrocyte membrane protein, and AAG12.