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Distribution of study characteristics for the primary outcome.
| Number of studies | ||
| PD model |
6-OHDA | 3 |
| MPTP | 5 | |
| Rotenone | 2 | |
| GLP-1 receptor agonist intervention | Liraglutide | 8 |
| Exenatide/exendin-4 | 3 | |
| Semaglutide | 2 | |
| Lixisenatide | 1 | |
| Outcome | TH + neurons in the SNpc | 6 |
| Striatal dopamine content | 2 | |
| TH + density in the SNpc | 2 | |
