6IPP:
reference: Disulfide-mediated conversion of 8-mer bowl-like protein architecture into three different nanocages., Zang J, Chen H, Zhang X, Zhang C, Guo J, Du M, Zhao G, Nat Commun. 2019 Feb 15;10(1):778. doi: 10.1038/s41467-019-08788-9. PMID: 30770832

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