6Z4E:
reference: Insight into the RssB-Mediated Recognition and Delivery of sigma(s) to the AAA+ Protease, ClpXP., Micevski D, Zeth K, Mulhern TD, Schuenemann VJ, Zammit JE, Truscott KN, Dougan DA, Biomolecules. 2020 Apr 16;10(4). pii: biom10040615. doi: 10.3390/biom10040615. PMID: 32316259

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