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Pathways of cytosine demethylation mediated by ten-eleven translocation (TET) proteins. AID, adenosine deaminase; BER, base excision repair; 5-caC, 5-carboxylcytosine; DNMT, DNA methyltransferase; 5-fC, 5-formylcytosine; 5-hmC, 5-hydroxymethylcytosine; 5-hmU, 5-hydroxymethyluracil; 5-mC, 5-methylcytosine; TDG, thymine DNA glycosylase.
