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Schematic diagram showing the genome organization of eight known CoVs of the genera Alphacoronavirus, Betacoronavirus, Gammacoronavirus, and Deltacoronavirus. The expanded regions below show the structural and accessory proteins in the 3′ regions of PEDV, TGEV, HCoV-229E, SARS-CoV-2, SARS-CoV, MERS-CoV, IBV, and PDCoV.
