although the prostaglandins , pge1 , pge2 pgf2 alpha , pgh2 , pgi2 and pgg2 , had no direct effect on the ductus arteriosus , pge1 , pge2 , pgh2 and pgi2 reversed the vasoconstrictor action of indomethacin .
C0033554
prostaglandins
C0012472
pge2