Examples of Comparative Analysis of Human Genomic Sequence
| Year | Length | Species | Gene | Reference |
| 1980 | 30 kb | H/M | Immunoglobulin heavy chain | Ravetch et al. 1980 |
| 1992 | 50 kb | H/primate | Globin genes | Gumucio et al. 1996 |
| 1994 | 100 kb | H/M | T cell receptor complex | Hood et al. 1995 |
| 1999 | 100 kb | H/M | Human 2p13 | Jang et al. 1999 |
| 2000 | 200 kb | H/M/D | Human 5q31 | Dubchak et al. 2000 |
| 2000 | 1 Mb | H/M | Interleukin gene cluster on 5q31 | Loots et al. 2000 |
| 2001 | 16 Mb | H/M | Human Chr 21 | Frazer et al. 2001 |
| 2001 | 2 Mb | H/M/D | Human Chr 21 | Frazer et al. 2001 |
[i] H, human; M, mouse; D, dog.