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Distribution of the −564 A/G polymorphism in the promotor region of the proteinase 3 gene. Black colour represents individuals homozygous for the A allele, white colour represents individuals homozygous for the G allele and grey colour represents heterozygotes. The results of 189 healthy blood donors are shown in (a) and 136 anti-neutrophil cytoplasm antibodies-associated systemic vasculitis patients are shown in (b).
