Anti-MP antibodies enable researchers to detect and measure the MP antigen in biological samples. This target is a reported synonym of the PPP1CB gene, which encodes protein phosphatase 1 catalytic subunit beta. This protein is known to function in the cell cycle, among other biological roles. The human version of MP has a canonical amino acid length of 327 residues and a protein mass of 37.2 kilodaltons. It is reported to be localized in the nucleus and cytoplasm of cells and widely expressed in many tissue types. MP is a member of the PPP phosphatase protein family.