5M29:
reference: Conformational Change of a Tryptophan Residue in BtuF Facilitates Binding and Transport of Cobinamide by the Vitamin B12 Transporter BtuCD-F., Mireku SA, Ruetz M, Zhou T, Korkhov VM, Krautler B, Locher KP, Sci Rep. 2017 Jan 27;7:41575. doi: 10.1038/srep41575. PMID: 28128319

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