comparison of rank orders of agonist potency of the naturally occurring prostanoids , pgd2 , pge2 , pgf2 alpha and pgi2 as well as the stable txa2 mimetic , u-46619 , on a range of smooth muscle preparations provides evidence for the existence of distinct receptors for pge2 , pgf2 alpha and txa2 .
C0033554
prostanoids
C0012472
pge2