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Figure 2 Linear regression of the association of macrophage area (mm²) identified by CD68 immunostaining and area of angiotensin I-converting enzyme-stained cells (mm²) in patients with stable angina (A) or unstable angina (B), showing both positive reactions. (A) r = 0.006, p = 0.9; (B) r = 0.6, p = 0.0001.