FOXP2 and schizophrenia: The mean of the absolute correlation between the unfiltered PRS (from the 20 genes) and the altered FCs was lower than using the PRS obtained from the FOXP2 cluster genes, and there was no significant correlation between the unfiltered PRS and FCs in both the early and later stages of schizophrenia (mean correlation coefficient in patients of short and long illness duration being 0.069 and 0.062, respectively, without significant difference).