Figure 2. Variants identified from 29 full-length S genes of severe acute respiratory syndrome–associated coronavirus from 20 SARS patients in comparison with BJ01 strain (GenBank accession no. AY278488). The nucleotide positions are numbered according to the sequence of BJ01 strain. Numbers start from the beginning of the genome, but the amino acid numbers start from the S protein. The filled arrows represent nonsynonymous mutations, and the hollow arrows represent synonymous ones. The occurrence indicates the frequency of the variant nucleotide at the given site of the identified 29 entire S genes.
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