GRM5 and autoimmune encephalitis: Much more seldom are the following cell-surface antibodies identified in children with autoimmune encephalitis: antibodies against the anti-dopamine 2 (DR2) receptor, gamma aminobutyric acid A/B receptor (GABAA/B)-receptor, glycin-receptor and metabotropic glutamate receptor 5 (mGluR5) (Cellucci et al. 2020).