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<p>from the marine <a href="page.php?w=diatom">diatom</a> <a href="page.php?w=Thalassiosira_weissflogii">Thalassiosira weissflogii</a>.</p>

<p>In many cases, the cofactor includes both an inorganic and organic component. One diverse set of examples is the <a href="page.php?w=heme">heme</a> proteins, which consist of a <a href="page.php?w=porphyrin">porphyrin</a> ring coordinated to <a href="page.php?w=iron">iron</a>.</p>

<p><big>Iron-sulfur clusters</big></p>
<p>Iron-sulfur clusters are complexes of iron and sulfur atoms held within proteins by cysteinyl</p><p>
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