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 AMPCyclic GMPPurinones4-(3-Butoxy-4-methoxybenzyl)-2-imidazolidinoneCyclic Nucleotide Phosphodiesterases, Type 2Cyclic Nucleotide Phosphodiesterases, Type 6MilrinoneSulfonesCyclic Nucleotide Phosphodiesterases, Type 7TheophyllinePurinesPyrrolidinonesTransducinRod Cell Outer SegmentKineticsPapaverinePhotoreceptor CellsAdenylate CyclasePyrophosphatasesVinca AlkaloidsNucleotides, CyclicCalmodulinEnzyme ActivationCattlePiperazinesXanthinesColforsinCyclic AMP-Dependent Protein KinasesIsoenzymesPyridazinesBucladesineGuanylate CyclaseRetinal Rod Photoreceptor CellsAmrinoneGlycerylphosphorylcholineIsoproterenolMolecular Sequence DataCyclic GMP-Dependent Protein KinasesRana catesbeianaCalcium8-Bromo Cyclic Adenosine MonophosphateCarbolinesPentoxifyllineAminophyllineAmino Acid SequenceCyclopropanesHydrolysisNucleotidasesErectile DysfunctionThionucleotidesDose-Response Relationship, DrugCyclic IMPDictyosteliumAminopyridinesEnoximonePhosphoinositide Phospholipase CGuanosine TriphosphatePyridones2',3'-Cyclic Nucleotide 3'-PhosphodiesteraseSubstrate SpecificityCells, CulturedCell MembraneSecond Messenger SystemsPenile ErectionTriazinesGuinea PigsRats, Inbred StrainsBase SequenceRhodopsinPhenylisopropyladenosineBrainSignal TransductionSubcellular FractionsImidazolesNitric OxideIsoquinolinesEnzyme InhibitorsMolecular WeightLightChromatography, Ion ExchangePhosphorus-Oxygen LyasesDibutyryl Cyclic GMPQuinolonesBinding SitesCatalytic Domain