Contrasted evolutionary constraints on secreted and non-secreted proteomes of selected Actinobacteria.

The Mann–Whitney U-test showed that the difference was highly significant (P < 0.001 in a two-tailed test).

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Conclusions A definite trend emerged from our analysis of the evolutionary rates and patterns for various gene types among five Frankia , five Mycobacterium and five Streptomyces genomes.

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These above results in total indicate an overall trend that the evolutionary constraints on secretory proteins as a whole in marginally free-living facultative symbiont or pathogenic strains were significantly increased compared to those occurring in saprophytic or free-living organisms.

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