Abstract
To examine the details of insertion for the D. malanogaster transposable element copia, we have isolated three independent pairs of genomic fragments which correspond to occupied and unoccupied target sites for insertion. Restriction endonuclease analysis suggests that sites with and without an element differ by a simple 5000 bp insertion. Direct DNA sequence analysis demonstrates that a 5 bp sequence, present once in the target DNA at the site of insertion, is found on both sides of the element after insertion. The 5 bp sequences which are duplicated are different in each case. Moreover, there does not appear to be any sequence homology among these three independent insertion sites
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