Imprecise excision of the progenitor insertion, resulting in a deficiency whose distal breakpoint is approximately 10kb upstream of Poxm. The proximal breakpoint maps distal to the more proximal deficiency Df(3R)dsx29 (since Df(3R)159 complements Df(3R)dsx29).
Df(3R)159 complements Df(3R)dsx29.
Heterozygotes are more susceptible to infection by E. cloacae than wild type.