?:definition
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Molecular assay reagents intended for use in identifying exchanges (i.e., translocations) between chromosome 1 band q23 and chromosome 19 band p13, usually involving genes PBX1 and E2A, respectively. This translocation is present in some patients with acute lymphoblastic leukemia. Its detection may be used as a tumor marker. This chromosome anomaly is associated with adverse prognoses.
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