TABLE 2 .

Transposition frequencies of DDE mutants

Plasmid	IS26	Target	Transposition frequencya
			Mean	No.b	Range
pRMH977	IS26	R388	1.7 × 10−7	3	5.1 × 10−8–3.7 × 10−7
pRMH978	IS26-FS-Lc	R388	<1.8 × 10−8	3	<1.1 × 10−8–<1.9 × 10−8
pRMH987	IS26 D82L	R388	<5.3 × 10−8	3	<4.3 × 10−8–<7.1 × 10−8
pRMH988	IS26 D142L	R388	<3.4 × 10−9	3	<2.8 × 10−9–<4.2 × 10−9
pRMH989	IS26 E177L	R388	<4.4 × 10−8	3	<1.8 × 10−8–<5.9 × 10−8
pRMH977	IS26	R388::IS26	2.1 × 10−4	3	1.9 × 10−4–2.4 × 10−4
pRMH978	IS26-FS-Lc	R388::IS26	8.4 × 10−6	3	7.3 × 10−6–9.2 × 10−6
pRMH987	IS26 D82L	R388::IS26	6.4 × 10−6	3	4.8 × 10−6–9.6 × 10−6
pRMH988	IS26 D142L	R388::IS26	6.4 × 10−6	3	3.5 × 10−6–1.1 × 10−5
pRMH989	IS26 E177L	R388::IS26	9.7 × 10−6	3	4.3 × 10−6–2.0 × 10−5

^aTransposition frequency expressed as cointegrates per transconjugant.

^bNumber of independent determinations.

^cIS26-FS-L is an IS26 tnp26 frameshift mutant.