TIt is difficult to summarize all the ways in which genomics and proteomics might affect the development of pharmaceutical agents, but a few examples illustrate the potential. Hypertension, congestive heart failure, hypercholesterolemia, and obesity are treated by pharmaceutical drugs that alter human physiology. Therapies are arrived at by identifying an enzyme or receptor involved in the process and discovering an inhibitor that interferes with its action. Proteomics will play an increasing role in identifying such potential drug targets. For example, the most potent vasoconstrictor known is the peptide hormone urotensin II. First discovered in fish spinal fluid, urotensin II is a small cyclic peptide, with 11 amino acid residues in humans and 12 or 13 in some other organisms. The vasoconstriction it induces can cause or exacerbate hypertension, congestive heart failure, and coronary artery disease. Some of the methods described in Section 9.3 for elucidating
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