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The apoptosis rates for the A973 cells after different treatment regimens (Q1–Q4 represent different quadrants, with Q4 showing the apoptotic cells). (A) Control groups; (B) Radiation-only groups; (C) Erlotinib-only groups; (D) Irradiation after erlotinib administration groups; (E) Simultaneous irradiation and erlotinib administration groups; and (F) Irradiation before erlotinib administration groups.
Abbreviations: PE-A, phycoerythrin antibody; FITC, fluorescein isothiocyanate.
