Anti-RGP3 antibodies enable researchers to detect and measure the RGP3 antigen in biological samples. This target is a reported synonym of the RGS3 gene, which encodes regulator of G protein signaling 3. This protein is known to function in GPCR signaling pathways, among other biological roles. The human version of RGP3 has a canonical amino acid length of 1198 residues and a protein mass of 132.3 kilodaltons, although 9 isoforms have been identified. It is reported to be localized in the cell membrane, nucleus, and cytoplasm of cells.