Naturally occurring peptides are substrates of enzymes and ligands of receptors. Many peptides serve as neurotransmitters and hormones. Because they control a variety of physiological processes, they are also implicated in different diseases. For several reasons peptides are usually unsuitable as drugs, so many efforts in medicinal chemistry aim at the development of peptidomimetics with improved properties. In contrast with proteins most peptides of small to medium size - 30 to

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