GRM5 and encephalitis: Given that mGluR5s are widespread in the brain, a reduced density of mGluR5 clusters on the neuronal surface was noticed in anti‐mGluR5 encephalitis (Maudes et al., 2022), we speculate that the mechanism of post‐HSE anti‐mGluR5 encephalitis is similar to anti‐NMDAR encephalitis.