Figure 1

Principal Components Analysis Plots of principal components 1, 2 (A, B) and 3, 4 (C, D) obtained from the amino acid composition of all their predicted open-reading frames as they correspond to the mean composition of the complete genomes (A, C) and their amino acid factor loadings (B, D). GC poor genomes (yellow), GC rich genomes (green), hyperthermophiles (red), thermophiles (orange), thermo-acidophiles (red-brown), solventogens (brown), alkalophiles (blue), extreme halophile (navy), and eukaryotes (purple). Note that there is only one genome representative for any cluster of strains or variants (i.e. Ecoli, EcoliE and EcoliH are all represented by Ecoli). In C, all remaining organisms are clustered around the number 1.