Check out this article: 'The Future of Peptide Development in the Pharmaceutical Industry' A very good article released in 2010 but still very relevant. Lots of answers.
http://www.polypeptide.com/assets/002/5188.pdf
From the article: 'The potential of peptides should be no surprise. Evolution has been honing the specificity of polypeptides for millions of years. Amino acid sequences – whether they are in peptides or in proteins – control and direct all aspects of cellular function and coordinate most intercellular communication. No other class of biological molecules offers the range of chemical diversity that peptides and proteins possess. They are nature’s tool kit and the more we can use native peptides or closely related analogs, the safer and more specific the drugs at the physician’s disposal.' .................... Cheers
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