Anti-OBP antibodies are used in antigen-specific immunodetection in biological samples. The target OBP is a known alias name of the protein odorant binding protein 2A, encoded by the OBP2A gene in humans. This 170-amino acid residue protein is known to bind and transports small hydrophobic volatile molecules with a higher affinity for aldehydes and large fatty acids, including undecanal, palmitic acid, efficient aldehydes, benzenic aldehydes, heterocyclic aldehydes and aliphatic acids. The protein is secreted and features post-translational modifications. In terms of tissue expression, it is reported to be highly expressed in the nasal structures, salivary and lachrymal glands, and lung.