Precise excision of the P-element which is located downstream of the tub transcription unit in the progenitor allele. The opus element insertion at -301 relative to the transcription start site remains.
abnormal dorsal/ventral axis specification | embryonic stage | maternal effect (with tubR5.6)
tub9Δ/tubR5.6 females produce embryos that span a phenotypic range from strongly dorsalised to wild type.