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→Agonists
* The rate of complex fromation is dependent on two factors: '''agonist concentration''' and the '''number of free receptors'''.
* The rate of complex fromation is dependent on two factors: '''agonist concentration''' and the '''number of free receptors'''.
* The '''affinty''' of a drug to a receptor varies and can be compared using the '''equilinbrum constant or KA'''.
* The '''affinty''' of a drug to a receptor varies and can be compared using the '''equilinbrum constant or K<sub>A</sub>'''.
This can be defined as the concentration of a drug which results in 50% of receptors being bound in equilibrium or when K<sub>1</sub>=K<sub>-1</sub>.