Table 2. Number of human genes expressed per tissue.
| Tissue/Cell | Number of genes* | Fraction of genes* | Ensembl genes† |
| Skeletal muscle1 | 11,276 | 0.61 | 11,953 |
| Liver1 , 3 | 11,392 | 0.61 | 12,191 |
| BT4744 | 11,844 | 0.64 | 12,808 |
| MB4354 | 11,847 | 0.64 | 12,726 |
| HME5 | 12,084 | 0.65 | 12,920 |
| T47D4 | 12,205 | 0.66 | 12,983 |
| Heart | 12,209 | 0.66 | 13,159 |
| MCF74 | 12,281 | 0.66 | 13,216 |
| Adipose tissue | 12,553 | 0.68 | 13,503 |
| Colon | 13,016 | 0.70 | 14,052 |
| Cerebellum2 , 3 | 13,132 | 0.70 | 14,043 |
| Kidney | 13,235 | 0.71 | 14,177 |
| Brain1 | 13,298 | 0.71 | 14,107 |
| Breast | 13,406 | 0.72 | 14,537 |
| Lymph node | 13,534 | 0.73 | 14,686 |
| Testes | 15,518 | 0.84 | 16,869 |
*annotations from RefSeq, protein-coding genes.
†number of protein-coding genes, annotations from Ensembl.
1
number of genes detected in mouse: skeletal muscle 11,799; liver 11,201; brain 13,626.
2
standard deviation for samples from different individuals: 106.
3
mean number for different individuals.
4
breast cancer cell line.
5
human mammary epithelial cell line.