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. 2021 Aug 13;40:101267. doi: 10.1016/j.nantod.2021.101267

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Fig. 4 — (a) Diagram of SARS-CoV-2, the virus that causes COVID-19. An enveloped virus with a lipid membrane featuring a “corona” of spike (S) proteins. Reproduced with permission from Scientific American from Ref. [48]. (b) The N-linked core oligosaccharide. N-linked glycans make up a part of SARS-CoV-2 spike proteins start as "core oligosaccharides" that have the structure shown. These are bound to the polypeptide chain through an N-glycosidic bond with the side chain of an asparagine.