Table 1.
Numbers of T2R genes and pseudogenes in vertebrates and their chromosomal/contig locationsa
| Species | Intact | Partial | Pseudo | Total | Fraction of pseudogenes | Chromosome/contig locations | |
| Mammal | Human | 24 | 0 | 10 | 34 | 28% | chr5,chr7,chr12 |
| Macaque | 26 | 1 | 11 | 38 | 29% | chr3,chr6,chr9,chr11,chrUn | |
| Mouse | 33 | 0 | 9 | 42 | 21% | chr2,chr6,chr15 | |
| Rat | 36 | 1 | 5 | 42 | 12% | chr2,chr3,chr4 | |
| Dog | 15 | 0 | 5 | 20 | 25% | chr14,chr16,chr27,chr34 | |
| Cow | 18 | 0 | 15 | 33 | 45% | chr4,chr5,chr20,chrUn | |
| Horse | 19 | 0 | 36 | 55 | 65% | chr4,chr6,chr21,chrUn | |
| Opossum | 26 | 3 | 7 | 36 | 19% | chr2,chr3,chr7,chr8 | |
| Platypus | 4 | 1 | 1 | 6 | 16% | chr4,Ultra450,Contig68031,Contig12097 | |
| Bird | Chicken | 3 | 0 | 0 | 3 | 0 | chr1,chr3 |
| Reptiles | Lizard | 37 | 2 | 10 | 49 | 20% | |
| Amphibians | Frog | 49 | 3 | 14 | 66 | 21% | |
| Teleost fishes | Fugu | 4 | 0 | 0 | 4 | 0 | chrUn |
| Puffer fish | 6 | 0 | 0 | 6 | 0 | chr2,chr12 | |
| Stickleback | 3 | 0 | 0 | 3 | 0 | chrXVI,chrXIII | |
| Zebrafish | 4 | 0 | 0 | 4 | 0 | chr8,chr9 | |
a Genome sequences of frog and lizard are not assembled into chromosomes so we do not list their scaffold locations.