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Immunohistochemical staining of 5mC, 5hmC, 5fC and 5caC in colon cancer tissues and adjacent non-tumor tissues. A/C/E/G represent cancer tissues, and B/D/F/H represent adjacent non-tumor tissues (**P < .01). 5caC = 5-carboxylcytosine, 5fC = 5-formylcytosine, 5hmC = 5-hydroxymethylcytosine, 5mC = 5-methylcytosine.
