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The genomic structure of Severe Acute Respiratory Syndrome Coronavirus-2. There are 14 open reading frames (ORFs) within the two primary transcriptional units ORF1a and ORF1b. S, Spike protein; E, Envelope protein; M, Membrane protein; N, Nucleocapsid protein; ns, Non-structural protein; RBD, Receptor binding domain; TM, Transmembrane region; S1, spike protein subunit 1; S2, spike protein subunit 2.
