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<p>have diverse biological functions including the transportation of <a href="page.php?w=diatomic">diatomic</a> gases, chemical <a href="page.php?w=catalysis">catalysis</a>, diatomic gas detection, and <a href="page.php?w=electron_transfer">electron transfer</a>. The heme iron serves as a source or sink of electrons during electron transfer or <a href="page.php?w=redox">redox</a> chemistry. In <a href="page.php?w=peroxidase">peroxidase</a> reactions, the <a href="page.php?w=porphyrin">porphyrin</a> <a href="page.php?w=molecule">molecule</a> also</p><p>
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