IFIH1 and psoriasis: In this study, we verified the psoriasis susceptibility genes IFIH1 (2q24.3), ERAP2 (5q15), IL18R1 (2q12.1), LTBR (12p13.31), IL1RL1 (2q12.1), CARD14 (17q25.3), and SLC9A4 (2q12.1).