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<p>and the effort to understand how enzymes work at an atomic level of detail.</p>

<p><big> Classification and nomenclature </big></p>
<p>Enzymes can be classified by two main criteria: either their enzymatic activity or their <a href="page.php?w=Protein_primary_structure">amino acid sequence</a> similarity (and thus evolutionary relationship).</p>

<p><big> Enzyme activity </big></p>
<p>An enzyme's name is often derived from its substrate or the chemical reaction it catalyzes, with the word ending in -ase. Examples are <a href="page.php?w=lactase">lactase</a>,</p><p>
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