Anti-P-B antibodies are used in antigen-specific immunodetection in biological samples. The target P-B is a known alias name of the protein submaxillary gland androgen regulated protein 3B, encoded by the SMR3B gene in humans. This 79-amino acid residue protein is a member of the PROL1/PROL3 protein family. The protein is secreted and features post-translational modifications.