Abstract
The presence of IS240 was investigated in 69 Bacillus thuringiensis (Bt) strains including strains from serotype H1 to H45 and additional strains with known Dipteran larvae toxicity. Restriction digests of total DNA and PCR products obtained with a single 16-bases primer corresponding to the IS240 inverted repeated sequence were hybridized with the IS240A element. The results indicate that 67% of the Bt strains tested, including all known mosquitocidal strains, possess at least one IS240-related element. PCR experiments indicate that IS240 represents a family of insertion sequences with several variants.
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