Keywords: DAG; diacylglycerol; D-PI; D-PIP, D-PIP2, derivatized PI, PIP, and PIP2; IP3; inositoltrisphosphate; MRM; multiple reaction monitoring; PI; phosphatidylinositol; PIP; phosphatidylinositol phosphate; PIP2; phosphatidylinositol bisphosphate; PLC; phospholip