Figure 1

Manhattan plot representation of the results of the HLA region in (A) giant cell arteritis, (B) Takayasu’s arteritis, and (C) the meta-analysis of both forms of vasculitis. The log10 of the P values are plotted against their physical chromosomal position. A red/green color gradient was used to represent the effect size of each analysed polymorphism (red for risk and green for protection). The red line represents the study-wide level of significance (P < 1.13E-06). HLA class I and II subregions are highlighted in grey.