Anti-lipopolysaccharide binding protein antibodies are used in the immunodetection of the protein encoded by the LBP gene. In humans, the canonical protein has a reported length of 481 amino acid residues and a mass of 53.4 kDa. Its subcellular localization is in the cytoplasm and is also secreted. It is notably expressed in blood serum. A member of the BPI/LBP protein family, it is reported to play a role in in the innate immune response. Post-translational modifications have been described, including glycosylation. Other names for this target antigen include BPI fold containing family D, member 2, LPS-binding protein, and BPIFD2.