Anti-PP4R1 antibodies enable researchers to detect and measure the PP4R1 antigen in biological samples. This target is a reported synonym of the PPP4R1 gene, which encodes protein phosphatase 4 regulatory subunit 1. This protein is known to function in protein dephosphorylation and protein phosphorylation, among other biological roles. The human version of PP4R1 has a canonical amino acid length of 950 residues and a protein mass of 107 kilodaltons, although 2 isoforms have been identified. Other names for this target antigen include MEG1 and PP4(Rmeg).