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Figure 4 Lipid fraction assessed by magnetic resonance imaging in three homogeneous components of aortic atherosclerotic lesions. The fibrous component showed the least amount of lipid (13 ± 13%), significantly less than that obtained from areas rich in foam cells (46 ± 12%, p < 0.0001) and necrotic cores (69 ± 14%, p < 0.0001 vs. fibrous plaque, p < 0.001 vs. foam cells).