Amino Acid Frequencies by Organism as a Percentage of Total Numbers of Residues
| Ala | Cys | Asp | Glu | Phe | Gly | His | Ile | Lys | Leu | Met | Asn | Pro | Gln | Arg | Ser | Thr | Val | Trp | Tyr | |
| Escherichia coli | 9.5 | 1.2 | 5.1 | 5.7 | 3.9 | 7.4 | 2.3 | 6.0 | 4.4 | 10.6 | 2.9 | 4.0 | 4.4 | 4.4 | 5.5 | 5.8 | 5.4 | 7.1 | 1.5 | 2.8 |
| Synechocystis | 8.5 | 1.0 | 5.0 | 6.0 | 4.0 | 7.4 | 1.9 | 6.3 | 4.2 | 11.4 | 2.0 | 4.0 | 5.1 | 5.6 | 5.1 | 5.8 | 5.5 | 6.7 | 1.6 | 2.9 |
| Mycobacterium jannaschii | 5.4 | 1.3 | 5.5 | 8.7 | 4.3 | 6.3 | 1.4 | 10.5 | 10.4 | 9.5 | 2.3 | 5.3 | 3.4 | 1.4 | 3.8 | 4.5 | 4.0 | 6.8 | 0.7 | 4.4 |
| Pyrococcus abyssi | 6.7 | 0.6 | 4.6 | 8.8 | 4.4 | 7.3 | 1.5 | 8.5 | 7.8 | 10.3 | 2.4 | 3.3 | 4.3 | 1.7 | 5.7 | 5.0 | 4.2 | 8.1 | 1.2 | 3.8 |
| Helicobacter pylori | 6.8 | 1.1 | 4.8 | 6.9 | 5.4 | 5.8 | 2.1 | 7.2 | 8.9 | 11.2 | 2.3 | 5.9 | 3.3 | 3.7 | 3.5 | 6.8 | 4.4 | 5.6 | 0.7 | 3.7 |
| Thermotoga maritima | 5.9 | 0.7 | 5.0 | 8.9 | 5.2 | 6.9 | 1.6 | 7.2 | 7.6 | 10.0 | 2.4 | 3.6 | 4.0 | 2.0 | 5.5 | 5.7 | 4.5 | 8.6 | 1.1 | 3.6 |
| Saccharomyces cerevisiae | 5.5 | 1.3 | 5.8 | 6.5 | 4.5 | 4.9 | 2.2 | 6.6 | 7.3 | 9.5 | 2.1 | 6.1 | 4.4 | 3.9 | 4.5 | 9.1 | 5.9 | 5.6 | 1.0 | 3.4 |
| Caenorhabditis elegans | 6.3 | 2.1 | 5.3 | 6.5 | 4.9 | 5.3 | 2.3 | 6.2 | 6.5 | 8.7 | 2.6 | 4.9 | 4.9 | 4.1 | 5.2 | 8.0 | 5.8 | 6.2 | 1.1 | 3.2 |
| Drosophila melanogaster | 7.5 | 1.9 | 5.2 | 6.4 | 3.5 | 6.2 | 2.7 | 4.9 | 5.6 | 9.2 | 2.4 | 4.7 | 5.5 | 5.2 | 5.6 | 8.3 | 5.6 | 5.9 | 1.0 | 3.0 |
[i] Frequencies were computed based on the sequences of all predicted ORFs for the respective genomes, including those whose identifications are only tentative.