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SARS-CoV-2 structure. The SARS-CoV-2 virion consists of a nucleocapsid and an envelope. The nucleocapsid contains ss(+)RNA surrounded by RNA-binding nucleocapsid (N) proteins. The nucleocapsid is surrounded by a lipid bilayer membrane that is derived from the cell membrane of the host cell but has viral proteins inserted: the membrane (M), envelope (E), and spike (S) proteins
