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Expression of polβ mRNA in colon tumor cell lines. The PCR-amplified polβ cDNA from LoVo, DLD1, and HCT116 cells was separated by 1% agarose gel electrophoresis. Two polβ mRNA segments, of ∼1 kb and ∼800 bp, were identified in these cells. The molecular weight markers in kilobases are shown on the left side of the figure.
