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<p> One dominant example is drug-receptor interactions as modeled by</p>

<p>
:<chem>L + R <=> LR </=></chem></p>

<p>where L, R, and LR represent ligand (drug), receptor, and ligand-receptor complex concentrations, respectively. This equation represents a simplified model of <a href="page.php?w=reaction_dynamics">reaction dynamics</a> that can be studied mathematically through tools such as <a href="page.php?w=thermodynamic_free_energy">free energy</a> maps.</p>

<p><big>Basics</big></p>
<p>There are four principal protein targets with which drugs can interact:</p><p>
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