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Perivascular DLL4 expression in Ewing’s sarcoma patient samples. A, Fourteen Ewing’s sarcoma patient samples, both primary and metastatic, from 10 patients were stained using anti-DLL4. DLL4+ cells are brown. B, Sections adjacent to those stained for DLL4 were stained with hematoxylin and eosin. Magnification is indicated.
