An interesting topic, however beyond the scope of this article, is the existence of IgG4-nervous system dependent diseases including myasthenia with muscle specific tyrosine kinase (MuSK) antibodies or chronic inflammatory demyelinating polyneuropathy (CIDP) with neurofascin-155, contactin-1/CASPR-1 antibodies, and anti- LGI 1 as well as in CASPR2-associated limbic encephalitis, neuromyotonia, and Morvan syndrome (57, 58). The gene discussed is MUSK; the disease is chronic inflammatory demyelinating polyradiculoneuropathy.