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Suggested structure of a consensus S. meliloti PHO box. The consensus nucleotide sequence is derived from a comparison of single PHO boxes identified in the promoter region of phnG (GenBank accession no. M96263) and the orfA-pta-ackA-fabI operon, as well as the two tandem PHO boxes reported for phoC (5). The E. coli consensus PHO box (57) is shown at the bottom for comparison. Nucleotides matching the S. meliloti consensus sequence for the −10 region and PHO box are underlined.
