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Immunocytochemical analysis of EGFRvIII expression in DU0722 primary glioblastoma cells. A. DU0722 cells stained positively (brown, DAB) for EGFRvIII, a glioma-associated antigen, demonstrating that the cells are derived from the HGL, not from contaminating normal cells. B. DU0722 cells failed to stain with DAB after treatment with a nonspecific isotype-matched control primary antibody.
