4G9I:
reference: Structure of the [NiFe]-hydrogenase maturation protein HypF from Thermococcus kodakarensis KOD1., Tominaga T, Watanabe S, Matsumi R, Atomi H, Imanaka T, Miki K, Acta Crystallogr Sect F Struct Biol Cryst Commun. 2012 Oct 1;68(Pt 10):1153-7., doi: 10.1107/S1744309112036421. Epub 2012 Sep 22. PMID: 23027738

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