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Serotonin levels in individual mice from tissue punches taken from the ventral midbrain and the dorsal raphe nucleus (ng/mg of tissue).
| Tph2 | +/+ | +/+ | +/− | +/− | −/− | −/− |
| Ventral midbrain | 5.93 | 8.46 | 2.97 | 7.35 | 0.13 | 0.55 |
| Dorsal Raphe | 5.58 | 9.39 | 3.86 | 3.68 | 0.21 | 0.14 |
