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A comparison on the average optical absorbance value of BDNF and TrkB immunoreactivity in the primary visual cortex of young and old cats (mean ± SD).
| Group | n | BDNF | TrkB |
|---|---|---|---|
| YC | 20 | 0.18 ± 0.06 | 0.20 ± 0.10 |
| OC | 20 | 0.14 ± 0.14** | 0.18 ± 0.07** |
**Indicates the average optical absorbance value of BDNF or TrkB immunoreactivity in the primary visual cortex was declined significantly in the old cats when compared with the young cats (One way ANOVA, P < 0.01).
