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cI protein

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cI protein ("CI", not "CL"), also known as the lambda repressor, is the sole protein expressed in the lysogenic state of Lambda phage. cI turns off transcription at the phage's L and R promoters as well as any other invading lambda phages into the host cell. It is a transcription factor and contains the common helix-turn-helix DNA binding domain.

References

http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pubmed&pubmedid=16591470

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