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A putative molecular switch is present within the 3′-UTR region of the FCoV C1Je genomic RNA consisting of a double stem loop structure and a pseudoknot. The nucleotide positions in the FCoV C1Je genome are indicated and nucleotides differing from those in the analogous structures of FIPV 79-1146 are shown in red. The 3′ end of ORF7b is highlighted in blue.
