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GBX2 activation by c-Myb requires signal transduction emanating from the cell surface while the leukemogenic AMV v-Myb constitutively induces the GBX2 gene. Mutations in the DNA binding domain of AMV-Myb render it independent of signaling events and concomitantly abrogate the collaboration between Myb and CCAAT Enhancer Binding Proteins (C/EBP), which are involved in granulocyte differentiation. Ectopic expression of GBX2 in growth factor-dependent myeloblasts induces monocytic features and independence from exogenous cytokines, reflecting distinct features of AMV-transformed cells. Our results suggest that Myb or factors it interacts with contribute to hematopoietic lineage choice and differentiation in a signal transduction-dependent fashion. 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