3WIN:
reference: Crystal Structure of Clostridium botulinum Whole Hemagglutinin Reveals a Huge Triskelion-shaped Molecular Complex., Amatsu S, Sugawara Y, Matsumura T, Kitadokoro K, Fujinaga Y, J Biol Chem. 2013 Dec 6;288(49):35617-25. doi: 10.1074/jbc.M113.521179. Epub 2013, Oct 28. PMID: 24165130

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