Phosphodiesterase Inhibitors3',5'-Cyclic-AMP PhosphodiesterasesPhosphoric Diester HydrolasesCyclic AMP3',5'-Cyclic-GMP PhosphodiesterasesPhosphodiesterase 4 InhibitorsCyclic Nucleotide Phosphodiesterases, Type 4Phosphodiesterase 3 InhibitorsPhosphodiesterase 5 InhibitorsPhosphodiesterase IRolipramCyclic Nucleotide Phosphodiesterases, Type 3Cyclic Nucleotide Phosphodiesterases, Type 1Cyclic Nucleotide Phosphodiesterases, Type 51-Methyl-3-isobutylxanthine2',3'-Cyclic-Nucleotide PhosphodiesterasesCyclic GMPPurinones4-(3-Butoxy-4-methoxybenzyl)-2-imidazolidinoneCyclic Nucleotide Phosphodiesterases, Type 2Cyclic Nucleotide Phosphodiesterases, Type 6MilrinoneTheophyllineSulfonesCyclic Nucleotide Phosphodiesterases, Type 7PyrrolidinonesPurinesAMP DeaminaseKineticsTransducinAdenylate CyclaseRod Cell Outer SegmentPapaverineBucladesinePhotoreceptor CellsAdenosine MonophosphateNucleotides, CyclicColforsinPyrophosphatasesEnzyme ActivationCalmodulinVinca AlkaloidsXanthinesCattleCyclic AMP-Dependent Protein KinasesIsoproterenolPiperazines8-Bromo Cyclic Adenosine MonophosphateReceptors, Cyclic AMPIsoenzymesCalciumPyridazinesMolecular Sequence DataGuanylate CyclaseAmrinoneRetinal Rod Photoreceptor CellsNucleotidasesGlycerylphosphorylcholineDose-Response Relationship, DrugAminophyllineAmino Acid SequenceRana catesbeianaThionucleotidesCyclic GMP-Dependent Protein KinasesHydrolysisDictyosteliumCarbolinesPentoxifyllineCyclopropanesCells, CulturedErectile DysfunctionCyclic IMPGuanosine TriphosphateAminopyridinesEnoximoneSecond Messenger SystemsRats, Inbred StrainsAdenosinePhosphoinositide Phospholipase CCell MembraneSubstrate SpecificityPyridonesPhenylisopropyladenosineGuinea PigsBase Sequence2',3'-Cyclic Nucleotide 3'-PhosphodiesteraseSignal TransductionAlprostadilTriazinesBinding SitesStimulation, ChemicalDibutyryl Cyclic GMPBrainIsoquinolinesPenile ErectionMagnesiumEnzyme InhibitorsImidazolesPhosphorylationMolecular Weight