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C, cytosine; 5meC, 5-methylcytosine; 5caC, 5-carboxylcytosine; 5fC, 5-formylcytosine; 5hmC, 5-hydroxymethylcytosine; DNMT, DNA methyltransferase; TET, ten-eleven translocation enzyme; TDG, thymine-DNA-glycosylase; BER, base excision repair.
