Gene Loss Dominates As a Source of Genetic Variation within Clonal Pathogenic Bacterial Species.

We found that across all investigated bacterial species there are highly significant negative correlations between AAI and genomic fluidity ( table 1 , P ≪ 0.001, for all comparisons, excluding Haemophilus influenza for which P = 0.0056, according to a Spearman correlation test).

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At the same time, when we carried out our comparisons across species, we found only a marginally significant correlation between the minimal AAI of a species and its maximal gene fluidity ( P = 0.034, according to the Spearman Rank correlation test; table 1 ).

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