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CoronavirusesCoronaviruses are large, often spherical, enveloped, single-stranded positive-sense RNA viruses, ranging in size from 80-220 nm. Of the four structural proteins encoded in the viral genome, the RNA winds around the highly basic nucleocapsid (N) protein. The three other structural proteins, envelope (E), membrane (M) and spike (S), are transmembrane proteins. The E protein is a small (9-12 kDa) single transmembrane domain protein, which enables virus assembly with the M protein, adoi:10.2218/gtopdb/f1034/2020.2 fatcat:r6j2g47rhjeybkn7zdp5mggja4