Figure 1.

Phylogenetic analysis of 13 Toxoplasma gondii strains based on analysis of the rop17 gene sequences. The tree was built by neighbor-joining (NJ), maximum likelihood (ML), and maximum parsimony (MP) analyses. The numbers at notes indicate bootstrap values resulting from different analyses in the order MP/NJ/ML. (a) The much higher genetic divergence in rop17 revealed two major clusters (denoted by I and II). (b) Subtree in the red box showing results of analysis using neighbor-joining (NJ).