1R6F:
reference: The structure of Yersinia pestis V-antigen, an essential virulence factor and mediator of immunity against plague., Derewenda U, Mateja A, Devedjiev Y, Routzahn KM, Evdokimov AG, Derewenda ZS, Waugh DS, Structure (Camb) 2004 Feb;12(2):301-6. PMID: 14962390

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