title: Ring theory.
mesh_terms: D001483:Base Sequence; D004247:DNA / Q000032:analysis*; D003854:Deoxyribonucleotides; D005092:Exonucleases; D008433:Mathematics; D008954:Models, Biological; D009690:Nucleic Acid Conformation
chemical_list: D003854:Deoxyribonucleotides; D004247:DNA; D005092:Exonucleases