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Cells from Ewing sarcoma exhibit cellular features and express markers, suggesting that the tumor is of neuroectodermal origin. Because Notch signaling regulates the differentiation of neuroectodermal cells during development, we examined the role of Notch signaling in Ewing sarcomas. We found that Ewing sarcomas express Notch receptors, ligands, and the Notch target gene HES1. To determine the functional...