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Persistence of polar and nonpolar virB1 and virB2 mutants in spleens of BALB/c mice. Data are the averages of results from experiments with groups of five mice ±standard error. Asterisks indicate significant (P < 0.05) differences in numbers of CFU of mutant strains recovered from mouse spleens compared to the wild type (wt) as determined by Tukey's HSD test following ANOVA.
