ERAP1 and Infertility: The protection against infertility and RIF is also observed in women with GG ERAP1 rs26653/HLA-C2C2/KIR AA combination (p/pcorr. = 0.003/0.025, OR = 0.093, and p/pcorr. = 0.004/0.036, OR = 0.084, respectively; Supplementary Table 13).