title: DNA methylation and its possible biological roles.
mesh_terms: D000225:Adenine / Q000378:metabolism; D001483:Base Sequence; D002454:Cell Differentiation; D002875:Chromosomes / Q000648:ultrastructure; D003596:Cytosine / Q000378:metabolism; D004247:DNA / Q000378:metabolism*; D004248:DNA (Cytosine-5-)-Methyltransferases / Q000502:physiology*; D004260:DNA Repair; D004262:DNA Restriction Enzymes / Q000378:metabolism; D008780:Methyltransferases / Q000502:physiology*; D009154:Mutation; D011995:Recombination, Genetic; D013379:Substrate Specificity
chemical_list: D003596:Cytosine; D004247:DNA; D008780:Methyltransferases; D004248:DNA (Cytosine-5-)-Methyltransferases; D004262:DNA Restriction Enzymes; D000225:Adenine