Nonamer peptides that ligated the Vα3S1/Vβ13S1-TCR displayed arginine at residues 2 and 7, and leucine at residue 9 and thus corresponded to the conserved amino acid pattern which is preferentially presented by HLA-C*06:02 and other psoriasis-associated HLA-class I molecules (Table 1) (43–45). Here, HLA-C is linked to psoriasis.