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A gene-cloning approach was used to determine the transcription polarity of the carbamoylphosphate operon (carAB) of Escherichia coli. In agreement with the accompanying paper (J. Bacteriol. 143:914-920, 1980), our results lead to the conclusion that carA is the proximal gene of the carAB operon.

Use of gene cloning to determine polarity of an operon: genes carAB of Escherichia coli