title: Relationship between intracellular dihydrofolate reductase and tightly bound intracellular methotrexate in human neoplastic cells.
mesh_terms: D002051:Burkitt Lymphoma / Q000201:enzymology; D002478:Cells, Cultured; D006801:Humans; D007945:Leukemia, Lymphoid / Q000201:enzymology; D007951:Leukemia, Myeloid / Q000201:enzymology; D008727:Methotrexate / Q000378:metabolism / Q000494:pharmacology*; D009369:Neoplasms / Q000201:enzymology*; D013762:Tetrahydrofolate Dehydrogenase / Q000378:metabolism*; D013997:Time Factors
chemical_list: D013762:Tetrahydrofolate Dehydrogenase; D008727:Methotrexate