Results of the association test on chromosome 6. A The -log(p-value) of the PC-corrected Armitage-trend test implemented in Eigenstrat are plotted for the 18,1278 SNPs located on chromosome 6 as a function of their position on the chromosome in base pairs (Build 36). SNPs located in the HLA region are highlighted in red. B Detail of the association signals for the 706 SNPs located in the HLA region. The horizontal line represents the 10-6 p-value threshold.