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In this study, we report the cloning of the rat cGMP-specific phosphodiesterase type 9 (PDE9A) and its localization in rat and mouse brain by non-radioactive in situ hybridization. Rat PDE9A was 97.6% identical to mouse PDE9A1 and showed 92.1% similarity on the amino acid level to the human homologue. PDE9A mRNA was widely distributed throughout the rat and mouse brain, with the highest expression...