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ActR/PrrA/RegA family redox response regulator transcription factor ActR, PrrA, and RegA are examples of lineage-specific names given to a response regulator transcription factor that acts as a global regulator and belongs to a sensor-regulator pair that is highly conserved in the alpha-proteobacteria. Examples of this regulator include ActR (acid tolerance regulator) in Sinorhizobium meliloti, stationary phase response regulator SpdR in Caulobacter crescentus,
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