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Ribbon diagram of the homology model of SARS-CoV RdRp with a docked RNA template–primer. α-Helices are shown as spirals and β-strands as arrows. The subdomains of the catalytic domain are colored as the N-terminal portion of the fingers subdomain (376–424) in magenta, the base of the fingers (residues 425–584 and 626–679) in blue, palm (residues 585–625 and 680–807) in red, and thumb (residues 808–932) in green.
