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Differentially expressed genes encoding ABC transporters between gefitinib-sensitive and -resistant cell lines. (A) Analysis of differentially expressed genes between PC9 and PC9/GR cell lines. (B) Analysis of differentially expressed genes between H292 and H292/GR cell lines. Expression intensities are displayed from blue (low expression) to red (high expression). *P < 0.05 compared to the parent-sensitive cell line.
