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Photomicrograph of the bronchial culture of a lung sample from a 75-year-old man with pulmonary histoplasmosis and hypercalcemia following allogeneic hematopoietic stem cell transplantation for acute myeloid leukemia (AML). The filamentous form of Histoplasmosis capsulatum is shown by lactophenol cotton blue staining for chitin in the wall of the fungus.
