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The brown coarsely granular material in macrophages in this alveolus is hemosiderin that has accumulated as a result of the breakdown of RBC's and release of the iron in heme.
图示：肺泡内巨噬细胞含铁血黄素沉着（呈褐色粗糙颗粒）。 是红细胞血红蛋白降解后所产生和释放的。
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