Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Basal level of extracellular acetylcholine (ACh) release in the parietal cortex in aged rats of the saline-treated control group and nicotine-treated group. Values of two samples at the beginning of experiments were averaged in each rat. Each column and vertical bar represents the mean ± SEM. n.s. non-significant difference between the values by unpaired t test
