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(A) Nucleotide substitutions within the 3′ NCR of South American YFVs compared to the prototype Asibi isolate. Substitutions shared among all South American isolates are indicated in red; sites that are partially conserved within genotypes I and II are indicated in black. (B) Schematic diagram showing the positions of informative sites within multiple sequence alignment of partial 3′ NCR sequences. Note that the alignment ends after the b4 loop.
