these results indicate that intrathecal noradrenaline , but not methionine-enkephalin and serotonin , produces more potent inhibition of the mechanical nociception than does the thermal one , and suggest a closer relationship of the descending noradrenergic system to the mechanical nociceptive system , in the spinal cord of rats .
C0014295
methionine-enkephalin
C0234194
nociception