3QQ2:
reference: Autotransporter passenger domain secretion requires a hydrophobic cavity at the extracellular entrance of the beta-domain pore., Zhai Y, Zhang K, Huo Y, Zhu Y, Zhou Q, Lu J, Black I, Pang X, Roszak AW, Zhang X, Isaacs NW, Sun F, Biochem J. 2011 May 1;435(3):577-87. PMID: 21306302

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