FIG. 3.

Phylogenetic tree based on infB gene sequences. The sequence of N. semolina was compared phylogenetically to those of the type species of the Pasteurellaceae as well as the members of Actinobacillus sensu stricto. E. coli was chosen as an outgroup. The tree was built with Bionumerics software (version 3.0) by using the Jukes-Cantor correction and neighbor joining for cluster analysis. The accession numbers of the sequences used are given. Bootstrap values for 500 simulated runs are given. The solid bar indicates 2% sequence divergence.