norepinephrine , epinephrine ( 10 ( -9 ) -10 ( -6 ) m ) and clonidine ( 10 ( -8 ) -10 ( -5 ) m ) inhibited the contraction induced by low frequency ( 2 or 5 hz ) transmural stimulation ( tms ) without inhibiting the contraction induced by acetylcholine ( ach , 6 x 10 ( -8 ) -4 x 10 ( -7 ) m ) .
C0028351
norepinephrine
C0014563
epinephrine