5LA3:
reference: Accumulating the hydride state in the catalytic cycle of [FeFe]-hydrogenases., Winkler M, Senger M, Duan J, Esselborn J, Wittkamp F, Hofmann E, Apfel UP, Stripp ST, Happe T, Nat Commun. 2017 Jul 19;8:16115. doi: 10.1038/ncomms16115. PMID: 28722011

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