Recombination between the two progenitor insertions has resulted in deletion of 74.5kb of sequence between them. The deletion was confirmed by PCR amplification.
Deletion of 70kb upstream of vvl, resulting from FLP-catalyzed recombination using the FRT-containing transposons PBac{WH}f05223 and PBac{WH}plef01945. At least 7 genes are removed.
Embryos homozygous for Df(3L)Dfvvl4 form an aberrant tracheal tree that does not fuse in a longitudinal dorsal trunk.