4A1R:
reference: The structure of Serratia marcescens Lip, a membrane-bound component of the type VI secretion system., Rao VA, Shepherd SM, English G, Coulthurst SJ, Hunter WN, Acta Crystallogr D Biol Crystallogr. 2011 Dec;67(Pt 12):1065-72. Epub 2011 Nov, 18. PMID: 22120744

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