6CV0:
reference: Cryo-EM structure of infectious bronchitis coronavirus spike protein reveals structural and functional evolution of coronavirus spike proteins., Shang J, Zheng Y, Yang Y, Liu C, Geng Q, Luo C, Zhang W, Li F, PLoS Pathog. 2018 Apr 23;14(4):e1007009. doi: 10.1371/journal.ppat.1007009., eCollection 2018 Apr. PMID: 29684066

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