FIG. 4.

Genomic duplication exemplified by strain 8117C. (A) PFGE gels of LT7 and 8117C. Lanes: 1, LT7 DNA cleaved by XbaI; 2, 8117C DNA cleaved by XbaI; 3, LT7 DNA cleaved by I-CeuI; and 4, 8117C DNA cleaved by I-CeuI. (B) Local comparison of LT7 and 8117C showing the duplication of I-CeuI E, which resulted in two hybrid rrn operons, the disappearance of the XbaI fragment F and SpeI fragment K (not shown on the PFGE picture), and the appearance of one new fragment each from XbaI (449 kb) and SpeI (334 kb) digestions.