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Figure 4 Oil red O staining of atherosclerotic lesions in the aorta. Representative photomicrographs (x10 magnification) of the lesions present in two uninfected mice. (A) Untreated with MF-tricyclic; (B) treated with MF-tricyclic, 12 mg/kg/day. The arrows point to some of the aortic valve leaflets, indicating that the sections employed for measuring lesion size are located, as is traditional, at the root of the aorta.