Fig. 2From: The missing link between long-term stimulation of nicotinic receptors and the increases of acetylcholine release and vasodilation in the cerebral cortex of aged ratsBasal 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 testBack to article page