(b)
| Revertant/plate | ||||
|---|---|---|---|---|
| Strain | HYC | 2-AF | FYFA | 2-NF |
| TA100 | 968 ± 103* | 194 ± 21 | 1133 ± 70* | |
| TA100 + | 521 ± 47* | |||
| TA100NR | 785 ± 97* | 247 ± 34 | ||
| TA98 | 870 ± 90* | 21 ± 5 | 189 ± 16* | 169 ± 7* |
| TA98 + | 808 ± 70* | |||
| TA98NR | 833 ± 71* | 25 ± 4 | 19 ± 4 | |
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