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    Image of alveolar pigment in the lung from a female Harlan Sprague-Dawley rat in a chronic study
    Lung, Alveolus - Pigment in a female Harlan Sprague-Dawley rat from a chronic study. The pigment is most likely hemosiderin and is contained within macrophages.
    Image of alveolar pigment in the lung from a male F344/N rat in a chronic study
    Lung - Pigment in a male F344/N rat from a chronic study. The golden brown pigment is most likely hemosiderin secondary to hemorrhage associated with acute inflammation.