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A prominent feature of the promoters of Bordetella pertussis fimbrial subunit genes fim2, fim3 and fimX is the presence of a ‘C‐stretch’, a monotonic run of C residues. The C‐stretch renders these genes capable of phase variation, through spontaneous variations in its length. For each of these we determined the length of the C‐stretch that gave maximal transcriptional activity, and found that the...
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