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DNA 5-hydroxylmethylcytosine(5hmC)catalyzed by ten-eleven translocation methylcytosine dioxygenase(TET)occurs abundantly in neurons of mammals.However,the in vivo causal link between TET dysregulation and nociceptive modulation has not been established.Here,we found that spinal TET1 and TET3 were significantly increased in the model of formalin-induced acute inflammatory pain,which was accompanied with the augment of genome-wide 5hmC content in spinal cord.