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(A) Numerous clusters of immature precursors in a hypocellular setting. Hypocellular acute myeloid leukemia. H&E.×200. (B) CD34 immunostain revealing many positive blasts. ×400. (C) Hypocellular myelodysplastic syndromes: note maturing cells with rare immature cell. H&E.×400. (D) Hypocellular myelodysplastic syndromes: CD34 immunostain with rare positive cells. ×400.
