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Genome organization of SARS-CoV. ORFs encoding the nonstructural proteins (black boxes), as well as ORFs encoding the structural polypeptides (gray boxes) are indicated Also, selected ORFs encoding for putative accessory genes (unshaded boxes) are shown. ORF7a (also called ORFX4 and ORF8) encoding peptide U122 is represented by the striated box. The ORFs shown are labeled according to Snijder et al. (23). S, spike; N, nucleocapsid.
