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https://www.ncbi.nlm.nih.gov/Structure/pdb/1DYH 1DYH: ISOMORPHOUS CRYSTAL STRUCTURES OF ESCHERICHIA COLI DIHYDROFOLATE REDUCTASE COMPLEXED WITH... DIHYDROFOLATE REDUCTASE5-DEAZAFOLIC ACIDCALCIUM IONCHLORIDE ION crystal structures escherichia coli