Furthermore, a genetic phenocopy of NMDAR-antibody encephalitis with mixed hyperkinetic movement disorders (chorea, dystonia, stereotypies, dystonia, oculogyric crises), seizures, and sleep cycle dysregulation is seen with mutations of GRIN1, the gene encoding the NR1 subunit of the NMDAR (Lemke et al., 2016). Here, GRIN1 is linked to Chorea.