the primary lipid substrates for the receptor mechanism seem to be two polyphosphoinositides , phosphatidylinositol 4-phosphate ( ptdins4p ) and phosphatidylinositol 4,5-bisphosphate ( ptdins4,5p2 ) , which are rapidly hydrolysed following receptor activation in various cells and tissues .
C0071655
polyphosphoinositides
C0031621
phosphatidylinositol