Figure 6

Evolutionary relationships of 28 VP4 proteins. The evolutionary history was inferred using the Neighbor-Joining method [25], implemented in MEGA4 [26]. The percentage of replicate trees in which the associated taxa clustered together in the bootstrap test (1000 replicates) are shown next to the branches [27]. Branches with less than 80% bootstrap support have been collapsed. The evolutionary distances were computed using the Poisson correction method [28] and are in the units of the number of amino acid substitutions per site. All positions containing gaps and missing data were eliminated from the dataset (Complete deletion option). There were a total of 229 positions in the final dataset. The Giraffe sequence is identified with the arrow as shown in the figure.