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Model for the control by AlgU of: motility, alginate synthesis, respiration, and nitrogen fixation upon encystment induction in A. vinelandii. Induction of encystment, which is likely to be caused by a stress condition, results in the release of AlgU by MucA. AlgU in turn activates transcription of alginate biosynthesis genes and CydR, which is the repressor of FlhDC and CydAB.
