CNTNAP1 and chronic inflammatory demyelinating polyradiculoneuropathy: Recently, autoantibodies against paranodal proteins, such as neurofascin 155 (NF155) (1, 2), contactin-1 (CNTN1) (3–5), and contactin-associated protein 1 (CASPR1) (6), were reported to be present among subsets of CIDP patients.