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Validation of differentially expressed genes. Expression of differentially regulated genes in erlotinib‐resistant versus erlotinib‐sensitive FaDu (A), SQ20B (B), Cal‐27 (C), and SCC‐25 (D) HNSCC cells were analyzed by quantitative RT‐PCR and GAPDH was used as an endogenous control. Dotted horizontal line indicates a fold change of 2.
