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Figure 1 Picro Sirius staining for collagen of atherosclerotic cross-sections. (A) Atherosclerotic plaque with a fibrous cap overlying lipid-rich areas. Thickness of the cap near the arrows is approximately 400 µm. (B) Atherosclerotic plaque with the atheroma adjacent to the lumen due to rupture of the thin fibrous cap. Thickness of the fibrous cap near the rupture (black arrows) is approximately 300 µm. (C) Rupture of the fibrous cap (black arrow).