The Extracytoplasmic Function (ECF) Sigma Factors

The Extracytoplasmic Function (ECF) Sigma Factors John D. Helmann Department of Microbiology, Wing Hall, Cornell University, Ithaca, NY 14853-8101, USA ABSTRACT Bacterial sigma (~) factors are an essential component of RNA polymerase and determine promoter selectivity. The substitution of one

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