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Structures of the backbone of a loop containing residues 41–51 in Mpros from four different genera (PDCoV, deep teal; HCoV-NL63, light orange; HCoV-229E, light pink; FIPV, pale cyan; PEDV, pale yellow; TGEV, silver; SARS-CoV-2, warm pink; SARS-CoV, salmon; MERS-CoV, light blue; HCoV-HKU1, pale green; MHV-A59, sumudge; IBV, slate).
