EMX1 and schizophrenia: Notably, EMX1, one of the genes within the forebrain regionalization gene set, contained a locus that reached genome-wide significance in the latest GWAS on schizophrenia.4 Indeed, an additional analysis showed that higher partitioned schizophrenia polygenic risk scores restricted to the EMX1 region were associated with reduced P300 amplitudes at the nominal significance level (mean difference per SD increase in polygenic risk score: −0.66 μV, 95% CI: −1.27 to −0.05, P = .033) (supplementary materials).