“D-Amphetamine (2.5-4mg/kg, ip), …, sc), L-dopa (25mg/kg, sc) plus benserazide (12.5mg/kg, sc), alpha-methyl-p-tyrosine (50mg/kg, ip) plus …, sc) and pargyline (50mg/kg, ip) significantly attenuated the antinociceptive effect of quinine (50mg/kg, ip), while DOPS (… not affect quinine antinociception.”