3CF4:
reference: Structure of the alpha2epsilon2 Ni-dependent CO dehydrogenase component of the Methanosarcina barkeri acetyl-CoA decarbonylase/synthase complex., Gong W, Hao B, Wei Z, Ferguson DJ Jr, Tallant T, Krzycki JA, Chan MK, Proc Natl Acad Sci U S A. 2008 Jul 15;105(28):9558-63. Epub 2008 Jul 9. PMID: 18621675

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