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Recombinant plasmids were constructed that carried various fragments of the DNA specifying the Escherichia coli genes ptsH and (part of) ptsI, the genes for the common components of the phosphoenolpyruvate : sugar phosphotransferase. Expression of plasmid-specified functions in minicells showed that ptsH and ptsI were transcribed clockwise. Most of the transcription of ptsI was from the ptsH promoter, but some was from a second site within or after ptsH.
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