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TUNEL assay of tumors. Sections of tumors embedded from tumor-bearing mice treated with (A) PBS, (B) Ad-EGFP, (C) Ad-T, (D) Ad-E and (E) Ad-T/Ad-E recombinant virus. Apoptotic nuclei were observed under a fluorescence microscope (×200). (F) The apoptosis index. TUNEL, terminal deoxynucleotidyl transferase-mediated dUTP nick end labeling.
