Anti-beta-2-glycoprotein 1 antibodies are protein reagents that detect specific antigens. The beta-2-glycoprotein 1 antigen is another term for the human protein apolipoprotein H, encoded by the APOH gene. The protein is known to bind to various kinds of negatively charged substances such as heparin, phospholipids, and dextran sulfate. Canonically, it has an amino acid length of 345 residues and a mass of 38.3 kilodaltons. It is a secreted protein and it is notably expressed by the liver and secreted in plasma. Other alias names for beta-2-glycoprotein 1 include B2G1, B2G1, and B2GP1. These beta-2-glycoprotein 1 antibodies are widely used in Western Blot experiments, among other applications.