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Hypercellular marrow with diffuse infiltrate of hairy cell leukemia cells (A, hematoxylin-eosin stain; B, CD20 immunostain, magnification ×400); Hypocellular marrow with interstitial infiltrate of hairy cell leukemia cells (C, hematoxylin-eosin stain, magnification ×1000; D, CD20 immunostain, magnification ×400); Hypocellular marrow with interstitial infiltrate of hairy cell leukemia variant cells (E, hematoxylin-eosin stain; F, CD20 immunostain, magnification ×400).
