The percentage of cells showing β-gal activity is shown for four undeprived animals
| Layer/cortical area | SI (barrel cortex) | VI | AI |
|---|---|---|---|
| II/III | 3.2 ± 1.8 | 15.4 ± 6.0 | 3.35 ± 0.07 |
| IV | 3.4 ± 1.4 | 16.1 ± 3.6 | 5.95 ± 3.61 |
Means and SEs are shown for cells counted in layers II/III and IV of the barrel cortex (SI) four animals, visual cortex (VI) four animals, and auditory cortex (AI) four animals. Visual cortex shows higher levels than other sensory cortices, as can also be seen macroscopically (see Figs. 1, 2).