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(A) Schematic diagram of the sso0777 promoter. The position of the primers used to obtain several promoter fragments (FrgA, FrgB and FrgC) is indicated. (B) EMSA experiments using FrgA, FrgB and FrgC fragments from sso0777 promoter shown above in the presence (+) or absence (−) of crude S. solfataricus cell extracts.
