Using previously measured cytokine protein levels in the same set of males [32], we were able to test for associations between DNA methylation and cytokine levels. Of the 48 differentially methylated regions associated with aggression, 7 regions were significantly correlated with cytokine levels encoded by the closest genes in blood plasma (FDR <0.2; Table 1). All but two were positively correlated with the cytokine levels in blood.