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We investigated possible epigenetic regulation of Period1 (PER1), a key circadian regulator gene, in six cervical cancer cell lines which showed up to 15.4-fold differences in PER1 mRNA levels. Genomic methylation analysis showed that a discerned CpG island in the PER1 promoter remained hypomethylated in five of the cell lines. In contrast, C33A cells that showed maximal PER1 expression was hypermethylated;...
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