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Amino acid sequence alignment of the α subunits of B. pertussis and E. coli. Alignment was performed at the National Center for Biotechnology Information by using the LFASTA network service. The substitution in BP1187 is indicated above the B. pertussis RpoA (BpeRpoA) sequence, and the position of a mutation in the E. coli α subunit affecting activation of class II promoters (22) is marked by an asterisk below the E. coli RpoA (EcoRpoA) sequence.
