Phosphodiesterase Inhibitors3',5'-Cyclic-AMP PhosphodiesterasesPhosphoric Diester Hydrolases3',5'-Cyclic-GMP PhosphodiesterasesPhosphodiesterase 4 InhibitorsCyclic Nucleotide Phosphodiesterases, Type 4Phosphodiesterase 3 InhibitorsPhosphodiesterase 5 InhibitorsPhosphodiesterase ICyclic Nucleotide Phosphodiesterases, Type 3RolipramCyclic Nucleotide Phosphodiesterases, Type 1Cyclic Nucleotide Phosphodiesterases, Type 51-Methyl-3-isobutylxanthine2',3'-Cyclic-Nucleotide PhosphodiesterasesCyclic AMPTyrosineCyclic GMPPurinonesTetranitromethane4-(3-Butoxy-4-methoxybenzyl)-2-imidazolidinoneFree RadicalsCyclic Nucleotide Phosphodiesterases, Type 2Cyclic Nucleotide Phosphodiesterases, Type 6MilrinoneRibonucleotide ReductasesSulfonesKineticsCyclic Nucleotide Phosphodiesterases, Type 7TheophyllinePurinesPyrrolidinonesElectron Spin Resonance SpectroscopyTransducinRod Cell Outer SegmentEnzyme ActivationPapaverinePhotoreceptor CellsSpectrophotometry, UltravioletCattleAdenylate CyclaseMolecular Sequence DataPyrophosphatasesVinca AlkaloidsAmino Acid SequenceNucleotides, CyclicCalmodulinTyrosine-tRNA LigaseIsoenzymesPiperazinesXanthinesPhosphorylationColforsinCyclic AMP-Dependent Protein KinasesSubstrate SpecificityPyridazinesBucladesineGuanylate CyclaseRetinal Rod Photoreceptor CellsBinding SitesAmrinoneGlycerylphosphorylcholineIsoproterenolCatalysisCyclic GMP-Dependent Protein KinasesRana catesbeianaCalcium8-Bromo Cyclic Adenosine MonophosphateCarbolinesPentoxifyllineAminophyllineOxidation-ReductionManganeseCyclopropanesBase SequenceHydrolysisSignal TransductionNucleotidasesErectile DysfunctionThionucleotidesThyroninesCells, CulturedProtein BindingDose-Response Relationship, DrugCyclic IMPDictyosteliumCell MembraneHydrogen-Ion ConcentrationAminopyridinesDiiodotyrosineEnoximoneProtein ConformationEscherichia coliProstaglandins GPhosphoinositide Phospholipase CRecombinant ProteinsMolecular WeightGuanosine TriphosphatePyridonesProtein-Tyrosine Kinases