3IQZ:
reference: Structural Basis of the Hydride Transfer Mechanism in F(420)-Dependent Methylenetetrahydromethanopterin Dehydrogenase., Ceh K, Demmer U, Warkentin E, Moll J, Thauer RK, Shima S, Ermler U, Biochemistry. 2009 Sep 29. PMID: 19761261

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