4A0E:
reference: Structure of the cytoplasmic domain of Yersinia pestis YscD, an essential component of the type III secretion system., Lountos GT, Tropea JE, Waugh DS, Acta Crystallogr D Biol Crystallogr. 2012 Mar;68(Pt 3):201-9. Epub 2012 Feb 7. PMID: 22349221

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