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- [31] PROTON MAGNETIC-RESONANCE STUDIES ON ESCHERICHIA-COLI DIHYDROFOLATE-REDUCTASE - ASSIGNMENT OF HISTIDINE C-2 PROTONS IN BINARY COMPLEXES WITH FOLATES ON THE BASIS OF THE CRYSTAL-STRUCTURE WITH METHOTREXATE AND ON CHEMICAL MODIFICATIONS JOURNAL OF BIOLOGICAL CHEMISTRY, 1979, 254 (17) : 8143 - 8152