Figure 2

Distribution of detoxification protein families in the GOS data. Gene counts normalized to per genome-equivalents based on the occurrence of the RNA-polymerase gene (top), and gene counts normalized to the average detoxification gene content of 835 completely sequenced bacterial genomes (bottom). For site names, blue color indicates open ocean sites, red corresponds to coastal sites, and green represents estuaries and embayments. Protein families are color coded as follows; red – oxidative stress, blue – metal resistance, green – transporters, purple – other detoxification systems, grey – control proteins.