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Phosphodiesterases (PDEs) are a superfamily of enzymes that degrade the intracellular second messengers cyclic AMP and cyclic GMP. These enzymes are essential regulators of cyclic nucleotide signaling with diverse physiological functions. PDEs are drug targets for the treatment of disease states including heart failure, depression, asthma, inflammation and erectile dysfunction. Of the 12 PDE gene families, cGMP specific PDE5 carries out the principal cGMP hydrolyzing activity.1,2