6M39:
reference: Cryo-electron microscopy structure of the SADS-CoV spike glycoprotein provides insights into an evolution of unique coronavirus spike proteins., Guan H, Wang Y, Perculija V, Saeed AFUH, Liu Y, Li J, Jan SS, Li Y, Zhu P, Ouyang S, J Virol. 2020 Aug 19. pii: JVI.01301-20. doi: 10.1128/JVI.01301-20. PMID: 32817223

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