P{GD12775} is inserted 2bp upstream of exon 3 of pk, resulting in overexpression of the sple isoform.
Expression of pkv22983 under the control of Scer\GAL4pnr-MD237 results in reversed orientation of the bristles and small epidermal hairs (trichomes) in the posterior region of the notum. The orientation of the wing hairs is also reversed.