4K8O:
reference: Mechanistic determinants of the directionality and energetics of active export by a heterodimeric ABC transporter., Grossmann N, Vakkasoglu AS, Hulpke S, Abele R, Gaudet R, Tampe R, Nat Commun. 2014 Nov 7;5:5419. doi: 10.1038/ncomms6419. PMID: 25377891

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