1QV9:
reference: Coenzyme F420-dependent methylenetetrahydromethanopterin dehydrogenase (Mtd) from Methanopyrus kandleri: a methanogenic enzyme with an unusual quarternary structure., Hagemeier CH, Shima S, Thauer RK, Bourenkov G, Bartunik HD, Ermler U, J Mol Biol 2003 Oct 3;332(5):1047-57. PMID: 14499608

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