Sensitivity testing revealed that KIR2DL2 remained associated with psoriasis even after including HLA-C*06:02 and HLA-C*12:03 alleles as covariates in the model, two individual HLA alleles that have been previously associated with psoriasis (8) (Figure 4; see Supplementary Table 3 for full results). Here, HLA-C is linked to psoriasis.