NFASC and Guillain-Barre syndrome, familial: In contrast, even though auto-antibodies against nodal/paranodal proteins such as neurofascin or contactin have been found in some cases of CIDP, it is still unclear how most AIDP and CIDP can occur, and no clinically applicable serum biomarkers of AIDP and CIDP have been developed to date1,5.