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Comparison of NOS activity between groups in cerebral cortex (X±SD, unit: U/mg protein)
| Group | 7 d (n) | 14 d (n) | 21 d (n) | 28 d (n) |
| Control group | 2.54±0.31 (7) | 1.64±0.22 (7) | 1.24±0.14 (8) | 1.26±0.07 (7) |
| 0.025% group | 2.42±0.19 (7) | 1.59±0.17 (6) | 1.27±0.12 (6) | 1.21±0.09 (6) |
| 0.05% group | 2.56±0.53 (7) | 1.77±0.19 (6) | 1.24±0.10 (5) | 1.19±0.42 (5) |
| 0.075% group | 1.29±0.14 (7)* | 1.03±0.15 (7)* | 0.69±0.10 (6)* | 0.53±0.09 (6)* |
Compared with the other 3 groups at the same day spans, P<0.001
