Anti-KCTD12 antibodies are used in the immunodetection of the protein potassium channel tetramerization domain containing 12. In humans, the canonical protein has a reported length of 325 amino acid residues and a mass of 35.7 kDa. Its subcellular localization is in the cell membrane. KCTD12 is reported to be an auxiliary subunit of GABA-B receptors that determine the pharmacology and kinetics of the receptor response. Synonyms for this target antigen include potassium channel tetramerisation domain containing 12, predominantly fetal expressed T1 domain, testicular tissue protein Li 100, and BTB/POZ domain-containing protein KCTD12.