Figure 2From: Concepts of pathogenesis in psoriatic arthritis: genotype determines clinical phenotypeCertain HLA-B alleles in the psoriatic arthritis cohort are significantly increased in frequency compared with their frequency in cutaneous psoriasis and healthy controls. Venn diagrams in each population illustrate the approximate proportion of individuals that bear the alleles. Ctrl, control; PsA, psoriatic arthritis; PsO, psoriasis where there is no arthritis.Back to article page