Fig. 4From: Dopamine-2 receptor antibody encephalitis presenting as pure tongue-biting in a tourette syndrome patient: a case reportSerum and CSF samples with anti-D2R antibody detected using cell-based assays in September 2020. (a) The arrow points to one positive cell diluted in the ratio of 1:100 in serum sample. (b) The arrow points to one positive cell diluted in the ratio of 1:1 in CSF sample. CSF, cerebrospinal fluidBack to article page