We fine-mapped DNA methylation in neuronal nuclei (NeuN+) isolated by flow cytometry from post-mortem frontal cortex of the brain of individuals diagnosed with schizophrenia, bipolar disorder, and controls (n = 29, 26, and 27 individuals, respectively; Supplementary Data 1, Supplementary Table 1, Supplementary Fig. 1). This evidence concerns the gene RBFOX3 and schizophrenia.