“Administration by microdialysis of 10 mM nicotine , resulting in a nicotine concentration of 0.134 μmol/g in the hippocampus, increased the extracellular levels of aspartic acid, glutamic acid , and serine by 26–60%.”
“Subcutaneous administration of nicotine at a dose of 6 μmol/kg caused a 57% increase in the extracellular level of glutamic acid.”