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Semi-quantitative scores for Iba-1 staining.
| Score | Microglial appearance |
| 0 | No activation |
| 1 | Foci of non-ramified active microglia |
| 2 | <50% coverage of active microglia |
| 3 | Widespread active and predominantly phagocytic microglia |
| 4 | Total phagocytic activation |
