we evaluated this hypothesis in chloralose-urethane anesthetized cats by monitoring the cardiovascular and respiratory responses to relative mu [ morphine , morphiceptin , d-ala2 , mephe4 , gly-ol5 enkephalin ( dago ) ] and delta [ d-ala2 , d-leu5enkephalin ( dadl ) ] agonists microinjected ( 0.5 ul/kg ) into the caudal region of the nucleus of tractus solitarius ( nts ) .
C0014298
enkephalin
C0525773
dago