Gene amplification in cultured animal cells.
D000818:Animals; D002478:Cells, Cultured; D004261:DNA Replication; D004351:Drug Resistance; D005111:Extrachromosomal Inheritance; D005784:Gene Amplification; D005786:Gene Expression Regulation; D006801:Humans; D008727:Methotrexate / Q000494:pharmacology; D008970:Molecular Weight; D011995:Recombination, Genetic; D013762:Tetrahydrofolate Dehydrogenase / Q000235:genetics
D013762:Tetrahydrofolate Dehydrogenase; D008727:Methotrexate