GRM5 and autoimmune encephalitis: Concurrently, CSF and serum tests for MOG antibody and an autoimmune encephalitis panel covering antibodies against NMDA, AMPA1, AMPA2, LGI1, CASPR2, GABAB, GABAA, IgLON5, DPPX, GlyR1, DRD2, GAD65, mGluR5, mGluR1, KLHL11, AQP4, MOG, GFAP, and neurexin-3α were conducted on a cell-based assay.