FIG. 5.

Phylogenetic tree constructed on the basis of the predicted amino acid sequences from the p28 genes of the E. chaffeensis strains. The predicted amino acid sequences of E. chaffeensis OMP-1F (19) and C. ruminantium MAP-1 (25) were included in the analysis to build the root of the tree. The Megalign program of Lasergene software was used to construct the tree. The length of each pair of branches represents the distance between sequence pairs. The scale beneath the tree measures the distance between the sequences.