title: Amplification and expression of sequences cotransfected with a modular dihydrofolate reductase complementary dna gene.
mesh_terms: D000818:Animals; D001483:Base Sequence; D002460:Cell Line; D006224:Cricetinae; D003412:Cricetulus; D004247:DNA / Q000235:genetics*; D004591:Electrophoresis, Polyacrylamide Gel; D005260:Female; D005784:Gene Amplification; D008727:Methotrexate / Q000494:pharmacology; D010053:Ovary / Q000166:cytology; D010957:Plasmids; D013539:Simian virus 40 / Q000235:genetics; D013762:Tetrahydrofolate Dehydrogenase / Q000235:genetics*; D014162:Transfection; D014169:Transformation, Bacterial; D014764:Viral Proteins / Q000096:biosynthesis
chemical_list: D014764:Viral Proteins; D004247:DNA; D013762:Tetrahydrofolate Dehydrogenase; D008727:Methotrexate