Synteny and sequence identity of flp/tad type A and B gene clusters. (a) Gene organization of P. fluorescens F113 (type B), P. aeruginosa PAO1 (type A), and Aggregatibacter actinomycetemcomitans 624 flp/tad gene clusters. Genes typed in red are specific of types A or B Flp/Tad pilus encoding clusters and therefore are not orthologous. (b) Synteny of the flp/tad clusters type A (P. aeruginosa PAO1) and B (P. fluorescens F113) with P. chlororaphis subsp. aurantiaca DSM 19603, harboring both clusters encoded in its genome. Arrows indicate the relative location, size, and direction of transcription of ORFs. Arrow colors depict the predicted gene product function as shown in the legend. Colored areas indicate genes belonging to the same OG and percentages depict amino acid sequence identity. NCBI access numbers and genomic coordinates of the regions shown are specified under the species names. Genes are scaled.