upon stimulation with 5-ht the initial water-soluble metabolites released are inositol trisphosphate and inositol bisphosphate with no change in the level of inositol monophosphate , suggesting that the primary lipid substrate used by the receptor is one of the polyphosphoinositides ( most likely pip2 ) rather than pi .
C0071655
polyphosphoinositides
C0031621
pi