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2.0 Angstrom structure of BtuF, the vitamin B12 binding protein of E. coli (PDB entry 1n2z)

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↑ Borths EL, Locher KP, Lee AT, Rees DC. The structure of Escherichia coli BtuF and binding to its cognate ATP binding cassette transporter. Proc Natl Acad Sci U S A. 2002 Dec 24;99(26):16642-7. Epub 2002 Dec 10. PMID:12475936 doi:10.1073/pnas.262659699