Carriers of ERAP1 rs6861666 AA and KIR in the BB centromeric region are at risk of infertility and RIF (p/pcorr. = 0.001/0.010, OR = 7.435, and p/pcorr. = 0.003/0.029, OR = 12.373, respectively; Supplementary Table 11). Here, KIR3DL1 is linked to Infertility.