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Spontaneous chromosomal aberration frequency of mice (n=20).
| Chromosomal aberration | ||||||
|---|---|---|---|---|---|---|
| Mice | No. of metaphases | Chromosomal fracture | Acentric | Unbalanced translocation | Total aberration | Aberration frequency (%) |
| IRM-2 | 1,200 | 4 | 1 | 1 | 6 | 0.5 |
| 615 | 1,200 | 10 | 2 | 2 | 14 | 1.2 |
| ICR/JCL | 1,200 | 12 | 3 | 1 | 16 | 1.3 |
