however , pretreatment of aortic rings with ltd4 ( 10 ( -7 ) m ) consistently and significantly enhanced the contractile effects of epi and norepi and lowered the threshold concentration of these agonists required to evoke contraction from 4 x 10 ( -9 ) to 3 x 10 ( -10 ) m ( p less than .05 ) .
C0014563
epi
C0028351
norepi