Anti-Contactin 2 antibodies are used in the immunodetection of the protein encoded by the CNTN2 gene. In humans, the canonical protein has a reported length of 1040 amino acid residues and a mass of 113.4 kDa. Its subcellular localization is in the cell membrane. A member of the Contactin protein family, it is known to be involved with axon guidance and cell adhesion. Post-translational modifications have been described, including glycosylation. Other names for this target antigen include FAME5, TAG-1, TAX, TAX1, axonal glycoprotein TAG-1, axonin-1 cell adhesion molecule, contactin 2 (axonal), and AXT.