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Bacterial sigma factors are required subunits of RNA polymerase that enable the recognition of specific start points for transcription (promoters). Alternative sigma factors are now recognized as major players in gene regulation.
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This page is a summary of: Where to Begin? Sigma factors and the selectivity of transcription initiation in Bacteria, Molecular Microbiology, May 2019, Wiley,
DOI: 10.1111/mmi.14309.
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