slbo open reading frame from P{Pw15} is replaced by a fragment carrying slbo whose leucine zipper is replaced by the homologous region the Saccharomyces cerevisiae GCN4 gene (the zipper sequence is exchanged at amino acid 384).
wild-type
slboXzip rescues slbounspecified
slboT:Scer\GCN4 efficiently rescues slbo- flies.