| Culture period (week) | Concentration (µM) | Tb/Cf | |
| Tb | Cf | ||
| 0 | 2.08 | 4.99 | 0.42 |
| 1 | 2.47 | 3.77 | 0.65 |
| 2 | 1.18 | 4.09 | 0.29 |
| 3 | 0.05 | 1.14 | 0.04 |
| 4 | 0.17 | 3.98 | 0.04 |
| 5 | 0.60 | 4.14 | 0.15 |