Summary of transcriptome analyses performed on biofilms colonized by different exogenous bacteria.

a<p>: Monospecies pathogen <i>E. coli</i> 55989a biofilm (P) versus monospecies commensal <i>E. coli</i> K12 MG1655 F′ (C): comparison.</p>b<p>: Commensal biofilm infected by identical commensal bacteria (C+C) versus monospecies commensal biofilm (C): comparison.</p>c<p>: Commensal biofilm infected by <i>E. coli</i> 55989a (mixed biofilm, C+P) versus monospecies commensal biofilm (C): comparison.</p>d<p>: Commensal biofilm infected by <i>E. coli</i> 55989a (mixed biofilm, C+P) versus commensal biofilm infected by identical commensal bacteria (C+C): comparison.</p>e<p>: p<0.05.</p>f<p>: “Unknown” regroups poorly characterized and unknown function genes of the COG classification plus non-classified genes coding mainly for hypothetical proteins.