4YXB:
reference: A common assembly module in injectisome and flagellar type III secretion sorting platforms., Notti RQ, Bhattacharya S, Lilic M, Stebbins CE, Nat Commun. 2015 May 21;6:7125. doi: 10.1038/ncomms8125. PMID: 25994170

This OCA Structure page
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