FIG. 3.

Genetic organization of the mdoC region of the E. coli chromosome (top) and restriction map of the 8-kb insert of pNF239 and its derivatives (bottom). Only relevant restriction sites are shown; arrows and T indicate transcriptional units and transcriptional terminators, respectively. PstI* and colE1 are part of the insert originating from the colE1 vector (9). Horizontal empty bars indicate the structure of the various inserts of the plasmids.