PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 20007733-2 2010 In this study, we determined whether the spontaneous pain and increased pNR1 expression induced by NMDA injection are reduced by IT injection of either clonidine or the mu-opioid receptor agonist, [D-Ala2, NMe-Phe4, Gly-ol5]-enkephalin (DAMGO). Clonidine 152-161 proenkephalin Rattus norvegicus 225-235