FIG. 3.

Diagrammatic representation of four clusters of intact, defective, and partial IS elements in pCD1. A p or −p indicates that only part of the IS element is present. A d indicates an IS element that is likely defective. Arrows show the presence of inverted repeats within IS elements. Each type of IS element is represented by a unique design that is maintained in each of the four panels. In panel D, the yadA′/′yadA pseudogene is represented as yadA. Numbers correspond to nucleotide positions in Fig. 1.