<prompt> All are second messenger exceptCyclic AMPGaunylyl cyclaseDiacycglycerolInositol triphosphate  <response>: remember that guanylyl cyclase an enzyme while cGMP is a secondary messenger Types ot secondary messenger are There are three basic types of secondary messenger molecules Hydrophobic DAG HydrophiliccAMP GasesNO Ref-KDT 7e p47,48 