1U6I:
reference: The structure of F420-dependent methylenetetrahydromethanopterin dehydrogenase: a crystallographic 'superstructure' of the selenomethionine-labelled protein crystal structure., Warkentin E, Hagemeier CH, Shima S, Thauer RK, Ermler U, Acta Crystallogr D Biol Crystallogr. 2005 Feb;61(Pt 2):198-202. Epub 2005, Jan 19. PMID: 15681872

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