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<p>A <b>tetrapeptide</b> is a <a href="page.php?w=peptide">peptide</a>, classified as an <a href="page.php?w=oligopeptide">oligopeptide</a>, since it only consists of four <a href="page.php?w=amino_acids">amino acids</a> joined by <a href="page.php?w=peptide_bond">peptide bond</a>s. Many tetrapeptides are <a href="page.php?w=Pharmacology">pharmacologically</a> active, often showing affinity and specificity for a variety of receptors in protein-protein signaling. Present in nature are both linear and <b>cyclic tetrapeptides</b> (CTPs), the latter</p><p>
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