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Degree of intergenic spacer variability between R. conorii and R. prowazekii genomes as estimated by BLASTN scores. The most variable spacers exhibited low scores, whereas the most conserved spacers had high scores. White diamonds represent the spacers amplified and sequenced in our study that were not discriminatory among R. conorii strains; black diamonds represent the discriminatory spacers. Dashed horizontal line, BLASTN score of 75.
