1UKF:
reference: The crystal structure of Pseudomonas avirulence protein AvrPphB: a papain-like fold with a distinct substrate-binding site., Zhu M, Shao F, Innes RW, Dixon JE, Xu Z, Proc Natl Acad Sci U S A 2004 Jan 6;101(1):302-7. Epub 2003 Dec 23. PMID: 14694194

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