to assess the effect of subaggregatory concentrations of catecholamines on the antiaggregatory effect of prostacyclin ( pgi2 ) , platelets from normal human volunteers were exposed sequentially in vitro to epinephrine ( less than or equal to 50 nm ) - or norepinephrine ( less than or equal to 1 microm ) followed by pgi2 and adenosine diphosphate ( adp ) .
C0014563
epinephrine
C0028351
norepinephrine