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Agonists are substances that activate cellular receptor molecules to which they attach. In a nutshell, agonists bind to cellular receptors and elicit a biological response. The agonists enhance the signal transduction by binding to the receptor in cellular systems. They can be full agonists, activating the receptor to maximal activity, or partial agonists. There are also inverse agonists. These ligands bind receptors and cause the reverse biological response of the natural ligand. Alfa Aesar supplies receptor agonists for many different cellular protein receptors. These reagents include both natural receptor ligands as well as synthetic agonists. In addition, the conformational changes brought about by the agonists activate or increase the activation of secondary intracellular messenger.