Anti-contactin associated protein family member 3B antibodies are used for the immunodetection of the protein encoded by the CNTNAP3B gene. In humans, the canonical protein has a reported length of 1288 amino acid residues and a mass of 140.4 kDa. Its subcellular localization is in the membrane. Alternative splicing is reported to yield 2 different isoforms for this protein. A member of the Neurexin protein family, it is known to be involved with cell adhesion. Post-translational modifications have been described, including glycosylation. Other names for this target antigen include cell recognition molecule Caspr3b, contactin associated protein like 3B, and contactin-associated protein-like 3B.