Immunogen sequence: QSQVGFIDFI VEPTFTVLTD MTEKIVSPLI DETSQTGGTG QRRSSLNSIS SSDAKRSGVK TSGSEGSAPI NNSVISVDYK SFKATWTE Highest antigen sequence identity to the following orthologs: Mouse - 94%, Rat - 97%. Cyclic nucleotide phosphodiesterases (PDEs) catalyz