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Refined model of the stem-loop structure based on genetic and structural experiments. Nucleotide numbering begins at the 3′ end of the genome, excluding the poly(A) tail, and the N gene stop codon is boxed. Dashed lines indicate alternative participation of nt 231 to 238 either in stem F or in one stem of a highly conserved pseudoknot that has been demonstrated to be essential in the 3′ UTR of BCoV (56).
