Mouse anti-5-Hydroxymethylcytidine monoclonal antibody for ELISA, Dot, IP. 5-Hydroxymethylcytosine is a DNA pyrimidine nitrogen base. It is formed from the DNA base cytosine by adding a methyl group and then a hydroxy group. It is important in epigenetics, because the hydroxymethyl group on the cytosine can possibly switch a gen