Table 1.
Somite counts in early ferret and mouse embryos
| Species |
Age |
Number animals |
Maximum Somites |
Minimum Somites |
Mean Somites |
SEM |
|---|---|---|---|---|---|---|
| Ferret | E17 | 6 | 32 | 28 | 30 | 0.6 |
| E18 | 8 | 40 | 28 | 34 | 1.7 | |
| E19 | 5 | 49 | 44 | 47 | 1.0 | |
| Mouse | E9.0 | 8 | 22 | 18 | 19 | 0.5 |
| E9.5 | 16 | 30 | 21 | 27 | 0.7 | |
| E10.0 | 24 | 34 | 29 | 32 | 0.3 | |
| E10.5 | 10 | 44 | 32 | 37 | 1.3 | |
| E11.0 | 3 | 48 | 44 | 46 | 1.2 | |
| E11.5 | 9 | 54 | 45 | 49 | 1.1 | |
Equivalent stages of ferret and mouse embryo development cannot be determined with somite counts alone. Older ferret and mouse ages are not included in the table because by E22 in ferrets and E12.0 in mice, cervical somites are no longer visible.