PI_PM <-> PIP_PM
PIP2_PM <-> DAG_PM + IP3_Cyt
PLC_PM <-> PLC_act_PM
PIP2_PHGFP_PM <-> DAG_PM + IP3_Cyt + PH_GFP_Cyt
PH_GFP_Cyt + PIP2_PM <-> PIP2_PHGFP_PM
IP3_Cyt <-> 0
PIP_PM <-> PIP2_PM
IP3_Cyt + PH_GFP_Cyt <-> IP3_PHGFP_Cyt