Anotherareacoveredinthisbook,onenotoftenhighlightedinsignaltransd- tionbooks,isthatofsignalingplatforms,whichisemergingasasigni?cantareaof researchrelevanttocellularmetabolism,cellproliferation,differentiation,apop- sis,neurodegenerativediseases,andcancer. Theauthorscontributingtothisbook vii viii Preface areexpertsandactivecontributorstoresearchintheirspeci?careasofsignaling. I would like to thank them for their contributions and their suggestions in the developmentofthebook. IwouldliketoacknowledgethehelpofFrankTedeschi, astudentinmydepartment,whoassistedineditingthemanuscriptsandinprep- ingtheindex. IwouldalsoliketothankDr. SabineSchwarz, LifeSciencesEditorat SpringerVerlag,andDr. JuttaLindenbornwhohavebeenveryhelpfulatevery stageofproductionofthisbook. AriSitaramayya Contents PartI GProteinsandGProtein-CoupledReceptors 1 TraditionalGPCRPharmacologyandBeyond. . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 AnnetteGilchristandMariaR. Mazzoni 2 RegulationofIntraneuronalTraf?ckingofG- Protein-Coupled ReceptorsbyNeurotransmittersInVivo . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .