6IIA:
reference: Crystal structures of multidrug efflux pump MexB bound with high-molecular-mass compounds., Sakurai K, Yamasaki S, Nakao K, Nishino K, Yamaguchi A, Nakashima R, Sci Rep. 2019 Mar 13;9(1):4359. doi: 10.1038/s41598-019-40232-2. PMID: 30867446

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