The inflammatory demyelination-specific expression of CXCL13 in the mouse and human peripheral nerves was represented in the sera of inflammatory demyelinating neuropathy patients, but not in the sera of AMAN and CMT1a patients, indicating the potential diagnostic utility of CXCL13 in inflammatory demyelinating peripheral neuropathy. This evidence concerns the gene CXCL13 and Guillain-Barre syndrome, familial.