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Phenotype distribution of membrane-proteinase 3 (mPR3) on neutrophils. Individuals divided into three predefined groups, high (black)/intermediate (grey)/low (white), according to their percentage of mPR3+ neutrophils [6]. The distribution of these three groups is shown in 58 patients with anti-neutrophil cytoplasm antibodies-associated systemic vasculitis compared to 107 healthy blood donors.
