FIG. 4.

Complementation of mutations in the mob regions of R1162 (A) and pSC101 (B). The pairs of plasmids in the donor strains (which also contained R751) are indicated by the left braces. In each case, the arrow adjacent to one of the plasmids points to its mobilization frequency from the donor. Simplified maps of the mob regions are given for each plasmid, with the parental maps at the top of the figure. The letters refer to the mob genes present in each case; the brackets designate deletions, and the inverted triangles show an inactivating insertion.