4BML:
reference: Protruding knob-like proteins violate local symmetries in an icosahedral marine virus., Gipson P, Baker ML, Raytcheva D, Haase-Pettingell C, Piret J, King JA, Chiu W, Nat Commun. 2014 Jul 2;5:4278. doi: 10.1038/ncomms5278. PMID: 24985522

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