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Morphological observation and detection of apoptosis-related proteins by western blot analysis. (A) AO staining and Ho.33342/PI double staining exhibited the anti-apoptosis of FaDu/T cells. (B) Cleaved caspase-3, caspase-9, Bcl-2 and Bax all changed to resist apoptosis during MDR progress. MDR, multidrug resistance; AO, acridine orange.
