1YHO:
reference: Solution structure of human dihydrofolate reductase in its complex with trimethoprim and NADPH., Kovalevskaya NV, Smurnyy YD, Polshakov VI, Birdsall B, Bradbury AF, Frenkiel T, Feeney J, J Biomol NMR 2005 Sep;33(1):69-72. PMID: 16222560

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