
Keywords: DOPAC, 3,4-dihydroxyphenylacetic acid; DHPG, dihydroxyphenylglycol; EDTA, ethylenediaminetetraacetic acid; HVA, homovanillic acid; HPLC, high-performance liquid chromatography; 5-HIAA, 5-hydroxyindoleacetic acid; MPTP, 1-methyl-4-phenyl-1,2,3,6-tetrahydro