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Phylogenetic tree of Rickettsia sequences from chiggers (bold letters) collected from rodents in North Carolina, USA, and reference sequences in GenBank (NCBI). The tree was inferred from the concatenated sequences (~733 bp) of three regions (23S-5S IGS, 17 kDa, and gltA) of the Rickettsia spp. genome by the neighbor-joining (NJ) method. The GenBank accession numbers are given in parentheses.
