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The effect of X-ray irradiation on methylation status of the Axin gene in lung cancer cell lines. There is no obvious change in unmethylated status of the Axin promoter and first intron in the LTE (A) and H460 (D) cell lines after X-ray irradiation, while significant demethylation could be detected in the second intron of H157 cells (B) and the promoter and first intron in H446 cells (C).
