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sediments. These observations indicate <br />that a direct microbial <br />arsenic - mobilizing activity exists <br />in the sediments, show that strain <br />MIT -13 is a strong arsenic - transforming <br />agent native to the sediments, and <br />suggest that dissimilatory arsenic <br />reduction may contribute to arsenic <br />flux from anoxic sediments in the <br />most arsenic - contaminated region of <br />the Aberjona Watershed. <br />12 <br />