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    Image of pigment in the mesentery, artery from a male F344/N rat in a chronic study
    Mesentery, Artery - Pigment in a male F344/N rat from a chronic study. Brown pigment is present in the wall of the artery (arrows).
    Image of pigment in the mesentery, artery from a male F344/N rat in a chronic study
    Mesentery, Artery - Pigment in a male F344/N rat from a chronic study (higher magnification of Figure 1). Macrophages containing brown pigment consistent with hemosiderin (arrows) are present in the arterial wall.