Histograms of pI values at 0.1 unit intervals for (A)Escherichia coli K12–, (B) Synechocystissp. strain PCC 6803–, (C) Methanococcus jannaschii–, (D) Pyrococcus abyssi–, (E) Thermotoga maritima–, and (F)Helicobacter pylori–predicted ORFs.