FIG. 6.

Neighbor-joining phylogenetic tree based on partial NS5-3′ NCR sequences (576 nt) of 117 South American isolates. To obtain sequences of identical lengths, the alignment was trimmed at the 3′ side of pk1′; thus, the alignment did not incorporate the duplicate copy of domain II structures for the YF-XL isolates. Sequences with 100% identity are represented by single branches. Isolates with no color highlighting have undetermined 3′ NCR status, because sequence for the genome terminus was not obtained.