KCNJ2 and familial dilated cardiomyopathy: In this study, we analyzed the expression levels of genes encoding the various ion channels that carry IK1 (Kir2.1 and Kir2.2), Iss (Kv2.1), Ito (Kv4.2 and the accessory subunit KChIP2), and IKur (Kv1.5) in WT and DCM mice at 3 months.