Table 3. Comparison of the number of ABCB1 genes in 62 species.
| ONE GENE | TWO GENES | |||
| Alpaca | Dolphin | Macaque | Shrew | Mouse |
| Anole lizard | Elephant | Marmoset | Sloth | Rat |
| Armadillo | Ferret | Medaka | Squirrel | Hamster |
| Bushbaby | Fruitfly | Megabat | Stickleback | |
| C. intestinalis | Fugu | Microbat | Tarsier | |
| Ciona savignyi | Gibbon | Mouse Lemur | Tasmanian devil | |
| C. elegans | Gorilla | Opossum | Tetraodon | |
| Cat | Guinea pig | Orangutan | Tilapia | |
| Chicken | Hedgehog | Panda | Tree Shrew | |
| Chimpanzee | Horse | Pig | Turkey | |
| Softshell turtle | Human | Pika | Wallaby | |
| Cod | Hyrax | Platyfish | Xenopus | |
| Coelacanth | Kangaroo rat | Platypus | Zebra Finch | |
| Cow | Lamprey | Rabbit | Zebrafish | |
| Dog | Hedgehog | S. cerevisiaie | ||