Fig. 2.
Southern blot analysis of 25 randomly chosen transposon insertion mutants. XmaI- or ApaI-digested chromosomal DNA was electrophoresed and transferred on a nylon membrane. The DNA fragments containing the transposon were detected with the DIG-labeled kanamycin resistance gene. The multiple bands were detected on two lanes indicated by an arrowhead, and these mutants were eliminated from this study.
