FRIEDKIN, M The use of dihydrofolate reductase in studies of mixed populations of sensitive and resistant leukemic cells. [electronic resource] - Cancer research Jun 1962 - 607-16 p. digital Publication Type: Journal Article ISSN: 0008-5472 Subjects--Topical Terms: AnimalsLeukemia, ExperimentalOxidoreductases--metabolismTetrahydrofolate Dehydrogenase