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DNA methylation-hydroxymethylation machinery. Transcript levels of (a) DNMT1 and (b) TET2 were quantified in the cDNA by qPCR using β-ACTIN as the housekeeping gene. The data are mean ± SD from 15 to 20 samples in each of the three groups (PDR, No-DR, and CONT). *P < 0.05 compared to the CONT group.
