drugs used were 5-hydroxytryptamine ( 5-ht ) , epinephrine ( epi ) , norepinephrine ( ne ) , phenylephrine ( phe ) , prostaglandin f2 alpha ( pgf2 alpha ) , atp , dopamine ( da ) , tyramine ( tyr ) , kcl , xylazine ( xyl ) and clonidine ( clo ) .
C0014563
epinephrine
C0028351
norepinephrine