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<p><a href="page.php?w=nitrogen_fixation">nitrogen fixation</a>. At least 50 molybdenum enzymes are now known in bacteria, plants, and animals, although only bacterial and <a href="page.php?w=Cyanobacteria">cyanobacterial</a> enzymes are involved in nitrogen fixation. Most <a href="page.php?w=nitrogenase">nitrogenase</a>s contain an iron-molybdenum cofactor <a href="page.php?w=FeMoco">FeMoco</a>, which is believed to contain either Mo(III) or Mo(IV). By contrast Mo(VI) and Mo(IV) are complexed with <a href="page.php?w=molybdopterin">molybdopterin</a></p><p>
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