Construct: Deletion between -0.7kb to -98bp that removes the 0.58kb pairing sensitive (PS) region.
wild-type
pbΔPst rescues pb5
Homeotic transformation and visible phenotype of pb5 homozygotes (labial palps are transformed to first thoracic legs and maxillary palps are reduced in size) can be rescued by two copies of P{ΔPst} constructs.