title: Multiple forms of human dihydrofolate reductase messenger RNA. Cloning and expression in Escherichia coli of their DNA coding sequence.
mesh_terms: D001483:Base Sequence; D002460:Cell Line; D004274:DNA, Recombinant; D003854:Deoxyribonucleotides / Q000032:analysis; D004351:Drug Resistance; D004587:Electrophoresis, Agar Gel; D004926:Escherichia coli / Q000235:genetics*; D005815:Genetic Code; D006801:Humans; D008727:Methotrexate / Q000494:pharmacology; D012333:RNA, Messenger; D013762:Tetrahydrofolate Dehydrogenase / Q000096:biosynthesis*; D014169:Transformation, Bacterial; D014295:Trimethoprim / Q000494:pharmacology
chemical_list: D004274:DNA, Recombinant; D003854:Deoxyribonucleotides; D012333:RNA, Messenger; D014295:Trimethoprim; D013762:Tetrahydrofolate Dehydrogenase; D008727:Methotrexate