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Immunohistochemical staining showing the expression of pSTAT3 (A-C) and VEGF (D-F) in GBM tissues. (A, B) Show low and high pSTAT3 expression, respectively; (D, E) Show low and high VEGF expression, respectively. Immunostaining is also seen in neovascular endothelial cells. (C, F) Show pSTAT3 and VEGF expression, respectively. Original magnification: × 400.
