All 3′, 5′ cyclic nucleotide phosphodiesterase enzyme activities were measured with a radiometric enzyme assay based on scintillation proximity assay detection system or a filtration binding format. Compounds tested were diluted in pure DMSO using 10‐point concentration response curves. Selectivity against PDE3A (catalytic domain), PDE4 (A, B, C, and D), PDE7B, and PDE8A were measured using [3H]‐cAMP, whereas selectivity against PDE2A, PDE5A, PDE6AB, PDE9A, PDE10A, and PDE11A were measured using [3H]‐cGMP, as described. 5
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