Injected Radioactivity Dose, Yohimbine Mass, and CYP2D6 Status
| Subject | MBq | Yohimbine (nmol) | CYP2D6 |
| 1 | 641 | 30.3 | 1 × 2 (F) |
| 2 | 441 | 4.6 | 4 × 1 (M) |
| 3 | 635 | 7 | 1 × 4 (M) |
| 4 | 715 | 21.4 | 4 × 4 (N) |
| 5 | 507 | 11.2 | 2 × 5 (M) |
| 6 | 169 | 11 | 2 × 2 (F) |
F, M, and N = fast, moderate, and nonmetabolizers, respectively, of 11C-yohimbine.