Recently, Day et al. identified six PCOS susceptibility loci that mapped to the genomic areas of 11q22.1 (YAP1), 2p21 (THADA), 11p14.1 (FSHB), 2q34 (ERBB4), 5q31.1 (RAD50) and 12q21.2 (KRR1) in a large cohort of European PCOS10. Here, ERBB4 is linked to polycystic ovary syndrome.