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<p>at high concentrations in a single isomerization. Instead, tracer perturbation can overcome these technical difficulties if there are two forms of the unbound enzyme. This technique uses <a href="page.php?w=Isotopic_labeling">isotope exchange</a> to measure indirectly the <a href="page.php?w=Reversible_reaction">interconversion</a> of the free enzyme between its two forms. The radiolabeled substrate and product <a href="page.php?w=diffusion">diffuse</a> in a time-dependent manner. When the system reaches <a href="page.php?w=chemical_equilibrium">equilibrium</a></p><p>
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