GNS and rheumatoid arthritis: Known glycan self-antigens are MOG for MS, Myelin oligodendrocyte glycoprotein antibody-associated disease (MOGAD) and NMO/NMOSD [123,124,125]; MAG for human demyelinating neuropathy [126]; GM1, GD1a, GT1a and GQ1b for GBS [127]; the latter also for BBE [128]; and N-acetylglucosamine-6-sulfatase (GNS) for Rheumatoid Arthritis [129].