5X5B:
reference: Cryo-EM structures of MERS-CoV and SARS-CoV spike glycoproteins reveal the dynamic receptor binding domains., Yuan Y, Cao D, Zhang Y, Ma J, Qi J, Wang Q, Lu G, Wu Y, Yan J, Shi Y, Zhang X, Gao GF, Nat Commun. 2017 Apr 10;8:15092. doi: 10.1038/ncomms15092. PMID: 28393837

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