5ZND:
reference: Selective Elimination of the Key Subunit Interfaces Facilitates Conversion of Native 24-mer Protein Nanocage into 8-mer Nanorings., Wang W, Wang L, Chen H, Zang J, Zhao X, Zhao G, Wang H, J Am Chem Soc. 2018 Oct 31;140(43):14078-14081. doi: 10.1021/jacs.8b09760. Epub, 2018 Oct 22. PMID: 30336004

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