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Article:
J. COURTLAND WHITE and
I. DAVID GOLDMAN
Mechanism of Action of Methotrexate: IV. Free Intracellular Methotrexate Required to Suppress Dihydrofolate Reduction
to Tetrahydrofolate by Ehrlich Ascites Tumor Cells in Vitro Mol Pharmacol September 1976 12:711-719; doi: