| Treatments | Number of revertants (M ± SD)/plate and (MI) | ||||||||
| TA 98 | TA 100 | TA 102 | TA 97a | ||||||
| mg/plate | −S9 | +S9 | −S9 | +S9 | −S9 | +S9 | −S9 | +S9 | |
| Vanillic acid | 0.0a | 28 ± 2 | 24 ± 2 | 104 ± 15 | 95 ± 6 | 271 ± 18 | 461 ± 21 | 125 ± 15 | 96 ± 10 |
| 0.39 | 28 ± 5 (1.0) | 21 ± 3 (0.9) | 113 ± 11 (1.1) | 95 ± 11 (1.0) | 241 ± 25 (0.9) | 518 ± 13 (1.1) | 98 ± 13 (0.8) | 98 ± 5 (1.0) | |
| 0.78 | 41 ± 2 (1.5) | 18 ± 3 (0.8) | 115 ± 15 (1.1) | 88 ± 14 (0.9) | 237 ± 13 (0.9) | 522 ± 16 (1.1) | 108 ± 10 (0.9) | 108 ± 2 (1.1) | |
| 1.56 | 31 ± 5 (1.1) | 21 ± 2 (0.9) | 91 ± 7 (0.9) | 89 ± 7 (0.9) | 268 ± 10 (1.0) | 500 ± 20 (1.1) | 113 ± 9 (0.9) | 103 ± 13 (1.1) | |
| 2.34 | 27 ± 2 (1.0) | 20 ± 1 (0.8) | 96 ± 11 (0.9) | 84 ± 7 (0.9) | 315 ± 8 (1.2) | 487 ± 15 (1.1) | 96 ± 3 (0.8) | 103 ± 18 (1.1) | |
| 3.13 | 27 ± 5 (1.0) | 21 ± 4 (0.9) | 99 ± 8 (0.9) | 92 ± 12 (1.0) | 293 ± 19 (1.1) | 471 ± 13 (1.0) | 84 ± 6 (0.7) | 97 ± 5 (1.0) | |
| Ctrol+ | 2064 ± 87b | 1213 ± 33e | 1252 ± 124c | 1870 ± 69e | 1173 ± 47d | 1822 ± 102f | 1968 ± 77b | 1850 ± 67e | |