Extended panels of autoimmune encephalitis autoantibodies performed in rat brains by IHC were negative (anti-NMDAR, AMPAR, GABABR, GABAAR, LGI1, CASPR2, mGluR1, mGluR2, mGluR5, DPPX, IgLON5, Neurexin). Here, GRM1 is linked to autoimmune encephalitis.