EnkephalinsEnkephalin, Ala(2)-MePhe(4)-Gly(5)-Enkephalin, LeucineEnkephalin, MethionineEnkephalin, D-Penicillamine (2,5)-Enkephalin, Leucine-2-AlanineEndorphinsReceptors, Opioid, muReceptors, OpioidReceptors, Opioid, deltaReceptors, Neurokinin-3NaloxoneReceptors, Opioid, kappaNeurokinin BEthylketocyclazocinePurinergic P1 Receptor AgonistsReceptors, TachykininTachykininsCyclazocineSerotonin Receptor AgonistsDopamine AgonistsD-Ala(2),MePhe(4),Met(0)-ol-enkephalinNarcotic AntagonistsSubstance PSerotonin 5-HT1 Receptor AgonistsNeurokinin AReceptors, Neurokinin-2MorphineSerotonin 5-HT2 Receptor AgonistsAdenosine A1 Receptor AgonistsDose-Response Relationship, DrugDynorphinsAnalgesics, OpioidBenzeneacetamidesRats, Sprague-DawleyGABA AgonistsAdenosine A2 Receptor AgonistsGuinea PigsNaltrexoneGABA-A Receptor AgonistsGABA-B Receptor AgonistsCannabinoid Receptor AgonistsBenzomorphansSerotonin 5-HT4 Receptor AgonistsPiperidinesOpioid PeptidesPurinergic P2 Receptor AgonistsRNA, Transfer, GlyAdrenergic alpha-2 Receptor AgonistsPyrrolidinesNarcoticsOligopeptidesNeurokinin-1 Receptor AntagonistsAdenosine A3 Receptor AgonistsHistamine AgonistsCarboxypeptidase Hbeta-EndorphinMuscarinic AgonistsAdenosineGlycineReceptors, Neurokinin-1MorphinansDiprenorphineReceptors, Dopamine D2Radioligand AssayAnalgesicsBaclofenRats, WistarEtorphineSerotonin Antagonists2,3,4,5-Tetrahydro-7,8-dihydroxy-1-phenyl-1H-3-benzazepineAdrenergic beta-3 Receptor AgonistsAmino Acid SequencePhenethylaminesReceptors, Dopamine D1Nicotinic AgonistsAdrenergic AgonistsPeptide FragmentsNeuronsReceptors, Purinergic P1QuinpiroleMolecular Sequence DataExcitatory Amino Acid AgonistsBinding, CompetitiveKineticsCyclic AMP8-Hydroxy-2-(di-n-propylamino)tetralinDrug InteractionsBenzazepinesBrainBehavior, AnimalReceptor, Adenosine A2ABenzylidene CompoundsCells, CulturedCannabinoidsInjections, IntraventricularAdrenergic beta-AgonistsThiorphanAdrenergic alpha-AgonistsAdrenergic alpha-1 Receptor Agonists