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Phylogenetic relationship among six members of the E. chaffeensis OMP-1 family and C. ruminantium MAP-1. The evolutionary distance values were determined by the method of Kimura (17), and the tree was constructed by unweighted pair-group method analysis. The scale bar shows 5% divergence in the amino acid sequences. The numbers at nodes are the proportions of 100 bootstrap resamplings that support the topology shown.
