Anti-IGKV3-20 antibodies are used in the immunodetection of the protein immunoglobulin kappa variable 3-20. In humans, the canonical protein has a reported length of 116 amino acid residues and a mass of 12.6 kDa. Its subcellular localization is in the cell membrane and is secreted. IGKV3-20 is known to be involved with adaptive immune responses.