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Two types of myeloperoxidase anti‐neutrophil cytoplasmic antibody (MPO‐ANCA) affinities: high and low affinities (n = 30) 30 MPA patients could be classified into a high‐affinity group (G1: solid line; 15 patients, and a low‐affinity group (G2: dotted line, 15 patients). Each point was assayed in triplicate.
