2OL6:
reference: Beta-strand flipping and slipping triggered by turn replacement reveal the opportunistic nature of beta-strand pairing., Makabe K, Yan S, Tereshko V, Gawlak G, Koide S, J Am Chem Soc. 2007 Nov 28;129(47):14661-9. Epub 2007 Nov 7. PMID: 17985889

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