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Schematic presentation of the 3.44-kb PstI fragment of the P. stutzeri chromosome covering the pilT and pilU genes (arrows indicate direction of transcription). The insertion site of pSUPTn5B20 is indicated by an arrow (Kmr). The lines with a dot on each end are the cloned DNA segments present in the different plasmids indicated. urf1 and urf2 are possible unknown ORFs.
