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The characteristics of the animal groups are shown. Substances given were sodium chloride (NaCl), substance P (SP), DL-Thiorphan (Th) and Captopril (Cap)
| Group | Experiment | Injected | No. Animals |
|---|---|---|---|
| 1 | No | No | 6 |
| 2 | 1 week | No | 6 |
| 3 | 1 week | Yes: NaCl | 5 |
| 4a | 1 week | Yes: SP + Th + Cap | 5 |
| 4b | 1 week | Yes: Cap + Th | 6 |
| 4c | 1 week | Yes: Cap | 6 |
| 5 | 3 weeks | No | 6 |
| 6 | 6 weeks | No | 6 |
