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The allantoin regulon of Escherichia coli, formed by three operons expressed from promoters allA P , gcl P and allD P , is involved in the anaerobic utilization of allantoin as nitrogen source. The expression of these operons is under the control of the repressor AllR. The hyperinduction of one of these promoters (allD P ) by allantoin in an AllR defective mutant suggested...