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Figure 3 Macrophage detection by immunohistochemistry in arterial sections. Photomicrographs of arterial sections stained with RAM11 antibody, specific for rabbit macrophages. A representative section of each treatment group is shown. A, Nontreated group. B, Atorvastatin-treated group. None of the control animals showed any stain (not shown). Arrow, presence of macrophages (brown) (magnification x400).