title: Ambiguity and transcriptional errors as a result of methylation of N-1 of purines and N-3 of pyrimidines.
mesh_terms: D001483:Base Sequence; D012321:DNA-Directed RNA Polymerases / Q000378:metabolism*; D007700:Kinetics; D008745:Methylation; D011131:Polyribonucleotides / Q000096:biosynthesis; D011687:Purines; D011743:Pyrimidines; D013379:Substrate Specificity; D013698:Templates, Genetic; D014158:Transcription, Genetic
chemical_list: D011131:Polyribonucleotides; D011687:Purines; D011743:Pyrimidines; D012321:DNA-Directed RNA Polymerases