Anti-peptidase, mitochondrial processing subunit beta antibodies are used for the immunodetection of the protein encoded by the PMPCB gene. In humans, the canonical protein has a reported length of 489 amino acid residues and a mass of 54.4 kDa. Its subcellular localization is in the mitochondria. A member of the Peptidase M16 protein family, it is a known catalytic subunit of the essential mitochondrial processing protease (MPP), which cleaves the mitochondrial sequence off newly imported precursors proteins. The gene encoding this protein is implicated in Multiple mitochondrial dysfunctions syndrome. Other names for this target antigen include MAS1, MPP11, MPPB, MPPP52, P-52, and Beta-MPP. Gene orthologs have been identified in the mouse, rat, bovine, frog, zebrafish, chimpanzee and chicken species.