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Distribution of orphan enzyme activities in a few model organisms
| EC numbers | |||
| Model organisms | Total | Orphans (/total) | Species specific orphans (/total orphans) |
| Escherichia coli | 1792 | 189 (0.11) | 25 (0.13) |
| Arabidopsis thaliana | 651 | 22 (0.03) | 0 (0) |
| Saccharomyces cerevisiae | 1254 | 129 (0.10) | 14 (0.11) |
| Drosophila melanogaster | 417 | 16 (0.04) | 4 (0.25) |
| Homo sapiens | 1560 | 225 (0.14) | 6 (0.02) |
