Figure 4

Evolutionary relationship of the three SU variants found in cat #261. Phylogenetic trees were constructed by the MP method. Trees were drawn to scale, with the length being relative to the number of changes over the entire sequence. The percentage of replicate trees in which the associated taxa clustered together in the bootstrap test (1,000 replicates) is shown next to the branches. A) Relationships at the DNA level. MP tree length: 765. The codon positions included were 1st + 2nd + 3rd + noncoding. There were a total of 1,363 base positions in the final dataset of which 349 were parsimony-informative. B) Relationships at the protein level. MP tree length: 329. There were a total of 453 amino acid positions in the final dataset of which 121 were parsimony-informative. GenBank accession numbers of the sequences included in the phylogenetic analyses are noted in square brackets following the virus identity. SP261-III, KI261-I and KI261-II (depicted in bold) were derived from cat #261.