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The arsenical resistance operon of R factor R773 was analyzed by subcloning and insertional inactivation. The operon was found to have two functional regions, the promoter-proximal region encoding resistance to arsenite and antimonate and the promoter-distal region encoding arsenate resistance. A unique 1.6-kilobase fragment was shown to be sufficient to encode arsenate resistance and produce arsenate extrusion from intact cells.
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Chen et al. (1985) studied this question.
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