Electroacupuncture stimulation at CV12, CV6 (Qihai), LR3, and ST36 in 6-OHDA-induced rats upregulated serum and SN levels of NPY, CCK, SST, and GAS, while decreasing the expression of the proapoptotic peptide PYY, thereby alleviating PD symptoms [62]. Here, NPY is linked to Parkinson disease.