Figure 4.

Violin plots showing the distribution in the isoelectric point of predicted proteomes among members of the genus Nitrosopumilus (in gray), AOA from soil/sediment (in yellow), host-associated AOA (in orange), mesopelagic AOA (in green), an obligately halophilic ammonia-oxidizing bacterium (in magenta) and typical planktonic bacteria (in white) relative to extreme (in red) and moderate (in purple) halophiles. The four panels show data for the overall predicted proteomes (a), as well as protein-coding genes without any trans-membrane domains (b), with a single trans-membrane domain (c), and those with two or more trans-membrane domains (d). The total gene counts for each data are shown on the right side of each panel. The dashed blue line demarcates a pI of 7.0, whereas ringed dots show the median pI.