FLP-mediated recombination between the two progenitor insertions has resulted in the deletion of the genomic sequence between them.
Df(2L)protΔ38.1/Df(2L)TE35B-9 males are fertile.
Df(2L)protΔ38.1/Df(2L)TE35D-5 males are sterile.
Homozygous males are sterile.
Mutant males show severely reduced fertility.