Table 5. The average optical density (OD) of Nissl staining.
| Group | Nissl staining | |
|---|---|---|
| OD (Mean±SD) | P value | |
| 0 | 0.777±0.030 | |
| PM2.5 | 0.787±0.041 | 0.664 |
| FA | 0.818±0.043 | 0.1174 |
| FA+ PM2.5 | 0.678±0.037 | 0.0019(**) |
**P<0.01, compared with the control group.
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