| 6ACG: reference: Cryo-EM structure of the SARS coronavirus spike glycoprotein in complex with its host cell receptor ACE2., Song W, Gui M, Wang X, Xiang Y, PLoS Pathog. 2018 Aug 13;14(8):e1007236. doi: 10.1371/journal.ppat.1007236. PMID: 30102747 |
This OCA 
Structure page
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(documentation).