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Fluorescence in situ hybridization (FISH) for the BCR-ABL fusion gene. (A) Peripheral blood neutrophil-FISH (PN-FISH); (B) FISH in bone marrow clot sections (BM-FISH). (B-1) shows MPO-positive myeloid cells. (B-2) shows a megakaryocyte. White arrows indicate BCR-ABL fusion signals. Red signals are from ABL probes, and green signals are from BCR probes.
