Table 1. List of species compared and the number of mRNA bases in the polyadenylation [poly(A)] site region analyzed.
| Species | Common Name | mRNA BasesAnalyzed |
| Non-mammal animals (invertebrates) | ||
| Apis mellifera | Honey bee | 37,400 |
| Drosophila melanogaster | Fruit fly | 190,800 |
| Caenorhabditis elegans | Nematode | 77,800 |
| Non-mammal animals (vertebrates) | ||
| Danio rerio | Zebrafish | 1,449,200 |
| Gallus gallus | Chicken | 157,600 |
| Taeniopygia guttata | Zebra finch | 161,600 |
| Mammals (vertebrates) | ||
| Bos taurus | Cattle | 535,800 |
| Homo sapiens | Human | 6,099,800 |
| Mus musculus | Mouse | 1,741,800 |
| Rattus norvegicus | Rat | 2,827,800 |
| Pongo abelii | Orangutan | 393,000 |
| Dicotyledonous plants | ||
| Arabidopsis thaliana | Arabidopsis | 886,200 |
| Medicago truncatula | A diploid alfalfa | 107,200 |
| Populus trichocarpa | Poplar | 274,200 |
| Solanum tuberosum | Potato | 27,800 |
| Monocotyledonous plants | ||
| Oryza sativa | Rice | 138,600 |
| Sorghum bicolor | Sorghum | 337,000 |
| Zea mays | Maize | 2,098,000 |