Figure 2.

Classification of the significantly differentially expressed genes into role categories. The genes were sorted into the 19 role categories established by the Comprehensive Microbial Resource (CMR). “Pressure” and “Pressure Oxygen” refer to the genes differentially expressed at elevated pressure and at combined elevated pressure and elevated DOT, respectively. For comparison, the gene distribution of the complete P. putida KT2440 genome is also depicted (Genome). For clarity reasons, a number was assigned to each category and is shown in the corresponding sector of the charts. Categories that were significantly over-represented as well as categories containing sub-categories that were significantly over-represented compared to the genome distribution are marked by the asterisk (*) and the hash (#), respectively (for more details, see the Additional file 1: Table S2-S3).