GRM1 and encephalitis: Additionally, autoantibodies associated with central nervous system demyelination (AQP4, MOG, MBP), encephalomyelitis/encephalitis (IgLON5, DPPX, DRD2, mGluR5, mGluR1, neurexin-3α, NMDA, AMPA1, AMPA2, LGI1, GABAb, CASPR2), and gangliosides (GM1, GM2, GM3, GM4, GD1a, GD1b, GD2, GD3, GQ1b, GT1a, GT1b, sulfatide) were undetectable in both blood and CSF, even on two separate occasions.