Anti-Gastrin-Releasing Peptide Receptor antibodies are used in the immunodetection of the protein encoded by the GRPR gene. In humans, the canonical protein has a reported length of 384 amino acid residues and a mass of 43.2 kDa. Its subcellular localization is in the cell membrane. It is reported to be highly expressed in pancreas. A member of the G-protein coupled receptor 1 protein family, it is a known receptor for gastrin-releasing peptide (GRP). Post-translational modifications have been described, including glycosylation. Other names for this target antigen include BB2R, BRS2, GRP-preferring bombesin receptor, bombesin receptor 2, and BB2.