TNFAIP3 and psoriasis: The TT>A risk haplotype is, however, distinct from a TNFAIP3 risk effect first reported in psoriasis and marked by SNP rs610604 [37] located in the sixth intron of TNFAIP3. The correlation in European and Asian populations between rs610604 and rs7749323, a perfect proxy for TT>A, is low (r2<0.1), indicating that psoriasis is likely associated with different causal variants.