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18S rDNA neighbor-joining tree of the 10 sequence type T4 isolates. The tree was rooted by T3 and T11 using the T3 strains S-7, Hay & Seal, Panola Mt., and Sawyer and the T11 strains RB:F:1, BH-2 and the T11 isolate 4RE as an outgroup. Bootstrap values are based on 1,000 replicates. The numbers at the nodes represent bootstrap values based on 1,000 replicates.
