“…A previous study has suggested that neuroactive ligand-receptor interactions may play an important role in the process of PD; meanwhile, Slc18a2, GRIN1 and GRIN2D may be potential candidate genes for PD progression. 46,47 Another metabolite, dopamine, an intermediate product of tyrosine metabolism should also be mentioned. The state of striatal dopamine release is of considerable importance in the diagnosis and research of PD.…”