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Comparison of sequences of the conserved region 2.3 among sigma factors of the proteobacteria. The 43 heat shock sigma factors were grouped according to Green and Donohue (7). The sequence of the E. coli heat shock sigma factor σ32 is underlined. Bold lettering highlights either the Y--W pattern seen in the alpha- and deltaproteobacteria or the V-F--H pattern characteristic of the gammaproteobacteria and some betaproteobacteria.
