Table 2. The organisms in which MetaCyc pathways were most frequently observed, and the number of MetaCyc pathways from those organisms.
| Escherichia coli | 173 |
| Salmonella typhimurium | 35 |
| Homo sapiens | 31 |
| Sulfolobus solfataricus | 20 |
| Bacillus subtilis | 18 |
| Soybean | 18 |
| Pseudomonas | 17 |
| Haemophilus influenzae | 15 |
| Mycoplasma capricolum | 12 |
| Saccharomyces cerevisiae | 8 |
| Pseudomonas putida | 7 |
| Mycoplasma pneumoniae | 7 |
| Ascomycotina | 6 |
| Rhizobiaceae | 5 |
| Clostridium | 4 |
| Pseudomonas aeruginosa | 4 |
| Thauera aromatica | 4 |
| Thermotoga maritima | 4 |
| Rhodococcus | 4 |
| Klebsiella pneumoniae | 4 |
| Archaea | 3 |
| Pseudomonadacea | 3 |
| Pseudomonas sp | 3 |
| Neisseriaceae | 3 |
| Klebsiella aerogenes | 3 |
| Rattus norvegicus | 3 |
| Archaebacteria | 3 |
| Methanosarcina barkeri | 3 |
| Sinorhizobium meliloti | 3 |