Immunogen sequence: EASKAETSSY VASSSTTIVG LHIADALRRS NTKGSMSDGS YSPDYSLAAV DLKSFKNNLV DIIQQNKERW KELAAQGESD LHKNSEDLVN AEEKHDETHS; Positive Samples: Mouse heart, Mouse brain, Mouse kidney, Rat heart, Rat brain. Cyclic nucleotide phosphodiesterases (PDEs)