Chromaffin GranulesChromaffin SystemAdrenal MedullaSynaptic VesiclesChromaffin CellsCattleAdrenal GlandsEnkephalinsCatecholaminesExocytosisCytoplasmic GranulesDopamine beta-HydroxylaseChromograninsChromogranin ASecretory VesiclesAdrenal CortexCalciumIntracellular MembranesNerve Tissue ProteinsAdrenal Gland NeoplasmsPhenylethanolamine N-MethyltransferaseSynaptophysinSynapsinsCells, CulturedSynaptotagminsVesicular Transport ProteinsMicroscopy, ElectronAdrenal Gland DiseasesTetrabenazineR-SNARE ProteinsCell FractionationKineticsCarboxypeptidase HPresynaptic TerminalsNorepinephrineVeratridineDigitoninReserpineChromogranin BEndocytosisVesicular Biogenic Amine Transport ProteinsAdrenal InsufficiencyCell MembraneSyntaxin 1Adenosine TriphosphatePyridinium CompoundsMembrane FusionTyrosine 3-Monooxygenaserab3A GTP-Binding ProteinNeurotransmitter AgentsEpinephrineMembranesAnnexin A7Vesicular Monoamine Transport ProteinsSynaptotagmin IDimethylphenylpiperazinium IodideTransport VesiclesCarbonyl Cyanide p-TrifluoromethoxyphenylhydrazoneCatecholamine Plasma Membrane Transport ProteinsDynamin ISynaptosomal-Associated Protein 25PC12 CellsCytoplasmic VesiclesNeuronsrab3 GTP-Binding ProteinsMolecular Sequence DataBiological TransportMembrane ProteinsSynaptic TransmissionMembrane PotentialsAmino Acid SequenceNeuropeptidesMuscarineSynapsesEnkephalin, MethionineAdrenal Cortex NeoplasmsSynaptosomesSynaptic MembranesNigericinNicotineSeminal VesiclesSNARE ProteinsProton-Translocating ATPasesSubcellular FractionsPotassiumMicroscopy, ImmunoelectronCarrier ProteinsDynaminsAscorbic AcidNerve EndingsEnterochromaffin CellsCytochrome b GroupHydrogen-Ion ConcentrationCalcium-Binding ProteinsPatch-Clamp Techniques