<p>The gene and cDNA of a procine derived CNP (C-type natriuretic peptide), and a procine derived CNP precursor protein and derivatives thereof are disclosed. The proceine derivative CNP precursor is represented by the following amino acid sequence: Met His Leu Ser Gln Leu Leu Ala Cys Ala Leu Leu Leu Thr Leu Leu Ser Leu Arg Pro Ser Glu Ala Lys Pro Gly Ala Pro Pro Lys Val Pro Arg Thr Pro Pro Gly Glu Glu Val Ala Glu Pro Gln Ala Ala Gly Gly Gly Gln Lys Lys Gly Asp Lys Thr Pro Gly Gly Gly Gly Ala Asn Leu Lys Gly Asp Arg Ser Arg Leu Leu Arg Asp Leu Arg Val Asp Thr Lys Ser Arg Ala Ala Trp Ala Arg Leu Leu His Glu His Pro Asn Ala Arg Lys Tyr Lys Gly Gly Asn Lys Lys Gly Leu Ser Lys Gly Cys Phe Gly Leu Lys Leu Asp Arg Ile Gly Ser Met Ser Gly Leu Gly Cys. These derivatives are novel and have natriuretic and hypotensive activities. <IMAGE></p>
