Figure 2 (A) Correlation between PR3-ANCA binding in ELISA and C-ANCA fluorescence intensity; (B) correlation between MPO-ANCA binding in ELISA and P-ANCA fluorescence intensity. ANCA, antineutrophil cytoplasmic antibodies; C-ANCA, cytoplasmic; P-ANCA, perinuclear; IIF, indirect immunofluorescence; MPO, myeloperoxidase; OD, optical density; PR3, proteinase 3.