we evaluated the ability of mu [ morphine , tyr-pro-n-mephe-d-pro-nh2 ( plo17 ) ] , delta ( tyr-d-pen-gly-phe-d-pen ) ( dpdpe ) and kappa [ u50,488h , ( trans-3,4-dichloro-n-methyl-n- ( 2- ( 1-pyr-rolidinyl ) cyclo-hexyl ) benzeneacetamine ) ] opioid receptor selective agonists to inhibit diarrhea induced by castor oil ( 0.6 ml p.o . ) in mice after supraspinal ( i.c.v . ) and peripheral ( s.c. ) administration .
C0011991
diarrhea
C0007343
castor oil