| Group | Dose (%) | Mean optical density | |
| CYP2B1 + CYP2B2 | CYP2E1 | ||
| Medium control | - | 88.3 ± 4.9 | 47.7 ± 2.7 |
| DMSO control | 0.5 | 81.3 ± 4.1 | 44.8 ± 2.2 |
| Monocrotaline | 0.05 | 83.0 ± 1.6 | 49.2 ± 2.5 |
| 0.2 | 91.5 ± 1.4* | 50.1 ± 0.2 | |
| Tussilago farfara alkaloids | 0.05 | 89.5 ± 4.7 | 51.7 ± 2.2* |
| 0.2 | 89.9 ± 7.0 | 54.3 ± 4.4** | |