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Maximum-likelihood phylogenetic tree showing the position of bacterial strains USFL332 and K22 within the genus Photorhabdus. The analysis is based on 703 aligned nucleotide positions of the gyrB sequences. Xenorhabdus and Proteus are used as closely related outgroup taxa. Sequences of species type strains are indicated by T. GenBank accession numbers are in brackets. Bootstrap values of more than 50% (from 100 replicates) are indicated at the nodes. Bar: 5% divergence.
