Figure 5

Relationship between growth time, operon number and transcriptional regulators per Mb. Bacteria were classified into 3 categories depending on the experimental growth time: fast growing (24–48 hours), median (3 to 7 days) and slow growing fastidious bacteria (more than 7 days). The 284 genomes for which information about time of growth is available are projected on the first two Principal Component Analysis (PCA) axes, which represent 66.2% and 19.5% of the total inertia. OI, obligate intracellular bacteria, dark red triangles; FHA, facultative host-associated, green asterisks; FL, free-living, blue squares.