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CD44 correlates with ROS defense, intracellular GSH level and cell surface xCT expression in NPC sphere cells. (a) Flow cytometric analysis of ROS level after CD44 knockdown by control and CD44 siRNA; (b) Intracellular GSH level of sphere cells was reduced after transfected with CD44siRNA. * p < 0.05; (c) Expression of cell surface xCT was analyzed after CD44 knockdown by control and CD44 siRNA.
