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The Journal of Biological Chemistry|May 25, 1976
Altered regulation of the rate of synthesis of dihydrofolate reductase in methotrexate-resistant hamster cellsU J Hänggi, J W Littlefield
Molecular & General Genetics : MGG|August 4, 1978
Isolation of a small DNA fragment carrying the gene for a dihydrofolate reductase from a trimethoprim resistance factorJ W Zolg, U J Hänggi, H G Zachau
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