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<p>atoms with their isotopes. The reactant is then allowed to undergo the reaction. The position of the isotopes in the <a href="page.php?w=product_%28chemistry%29">products</a> is measured to determine what sequence the isotopic atom followed in the reaction or the cell's metabolic pathway. The <a href="page.php?w=nuclide">nuclide</a>s used in isotopic labeling may be <a href="page.php?w=stable_nuclide">stable nuclide</a>s or <a href="page.php?w=radionuclide">radionuclide</a>s. In the latter case, the labeling is called <a href="page.php?w=radiolabeling">radiolabeling</a>.</p><p>
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