The P{}sroP54 insertion (which is inserted in the region upstream of kay) causes loss of function of both the kay and sro genes; there is a large reduction in the CG12068 transcript level (the annotation corresponding to sro) in homozygous embryos and the P{}sroP54 chromosome fails to complement mutations in both kay (kay1) and sro (sroO4-105 and sro1).
Mutants show a severe "shroud" cuticle phenotype.
The "shroud" mutant phenotype is reverted by precise excision of the insertion.