ERAP1 and Infertility: Women carrying rs26653 ERAP1 GG/HLA-C2C2 combination are protected from infertility and RIF (p/pcorr. = 0.002/0.022, OR = 0.343, and p/pcorr. = 0.001/0.005, OR = 0.252, respectively; Supplementary Table 5), while those with CG/HLA-C2C2 are predisposed to RIF (p/pcorr. = 0.002/0.016, OR = 3.661).