d-ins ( 1,4,5 ) p3 is now recognized as an intracellular messenger that mediates the actions of many cell-surface receptors on intracellular ca2+ pools , but its complex and rapid metabolism in intact cells has confused interpretation of its possible roles in oscillatory changes in intracellular [ ca2+ ] and in controlling ca2+ entry at the plasma membrane .
C0034800
cell-surface receptors
C0007603
plasma membrane