6Q93:
reference: Crystal structure of VnfH, the iron protein component of vanadium nitrogenase., Rohde M, Trncik C, Sippel D, Gerhardt S, Einsle O, J Biol Inorg Chem. 2018 Oct;23(7):1049-1056. doi: 10.1007/s00775-018-1602-4. Epub, 2018 Aug 23. PMID: 30141094

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