Phosphodiesterase Inhibitors3',5'-Cyclic-AMP PhosphodiesterasesPhosphoric Diester Hydrolases3',5'-Cyclic-GMP PhosphodiesterasesPhosphodiesterase 4 InhibitorsCyclic Nucleotide Phosphodiesterases, Type 4Cyclic GMPPhosphodiesterase 5 InhibitorsPhosphodiesterase 3 InhibitorsCyclic Nucleotide Phosphodiesterases, Type 3Phosphodiesterase ICyclic Nucleotide Phosphodiesterases, Type 5RolipramCyclic Nucleotide Phosphodiesterases, Type 11-Methyl-3-isobutylxanthineCyclic AMPPurinones2',3'-Cyclic-Nucleotide PhosphodiesterasesCyclic Nucleotide Phosphodiesterases, Type 24-(3-Butoxy-4-methoxybenzyl)-2-imidazolidinoneCyclic Nucleotide Phosphodiesterases, Type 6SulfonesMilrinoneCyclic GMP-Dependent Protein KinasesGuanylate CyclasePurinesCyclic Nucleotide Phosphodiesterases, Type 7TheophyllineRod Cell Outer SegmentPyrrolidinonesNucleotides, CyclicPhotoreceptor CellsTransducinKineticsPapaverineNitric OxideEnzyme ActivationAdenylate CyclaseVinca AlkaloidsCattleCalmodulinPyrophosphatasesPiperazinesNitric Oxide DonorsRetinal Rod Photoreceptor CellsCyclic AMP-Dependent Protein KinasesColforsinXanthinesRana catesbeianaCalciumOxadiazolesIsoenzymesCyclic IMPThionucleotidesBucladesine8-Bromo Cyclic Adenosine MonophosphateCyclic GMP-Dependent Protein Kinase Type IMolecular Sequence DataIsoproterenolPyridazinesSecond Messenger SystemsDose-Response Relationship, DrugCarbolinesAmino Acid SequenceAmrinoneGlycerylphosphorylcholineCells, CulturedDictyosteliumNitroprussideAtrial Natriuretic FactorHydrolysisEnzyme InhibitorsErectile DysfunctionSignal TransductionPentoxifyllineAminophyllineGuanosine TriphosphateCyclopropanesNucleotidasesAminopyridinesVasodilator AgentsEnoximoneRats, Sprague-DawleyCell MembranePyridonesPenile ErectionSubstrate SpecificityQuinoxalinesPhosphoinositide Phospholipase CTriazinesS-Nitroso-N-AcetylpenicillamineRhodopsin2',3'-Cyclic Nucleotide 3'-PhosphodiesteraseNatriuretic PeptidesPhosphorylationPenicillamineImidazolesBase SequenceLightGuinea Pigs