3BZS:
reference: Structural analysis of the essential self-cleaving type III secretion proteins EscU and SpaS., Zarivach R, Deng W, Vuckovic M, Felise HB, Nguyen HV, Miller SI, Finlay BB, Strynadka NC, Nature. 2008 May 1;453(7191):124-7. PMID: 18451864

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