FIG 1.
Neighbor-joining (NJ) tree based on the comparison of leuS gene sequences of Citrobacter species analyzed in this study. Genetic distances were constructed using Kimura's two-parameter model. Numbers at branch points indicate bootstrap percentages (1,000 replications) from NJ analysis, and only values greater than 80% are shown. Horizontal bar, genetic distance of 0.05. Citrobacter species type strains are underlined, and the qnrB alleles are shown in parentheses. Pantoea ananatis strain LMG 2665T was used as the outgroup (PATRIC fig|1378093.3.peg.2577). Please refer to Table S2 in the supplemental material for accession numbers of the sequences used.