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Representative photomicrographs of the p53 content evaluated by immunohistochemistry in UGBM1 human GBM spheroids (A); Hsp 70 content following 5 Gy irradiation in MO59J spheroids (B); EGFr contents in no-irradiated (control) (C) and 5 Gy irradiated MO59J spheroids (D). EGFr antibody clone H11, recognizes wild-type EGFr and the deleted mutant form (EGFrvIII). Original magnification × 400.
