slbo open reading frame from P{Pw15} is replaced by a fragment carrying slbo fused to the Scer\GAL4 activation domain (amino acids 768 to 881) at amino acid 318.
slboGAL4L partially rescues slbounspecified
P{GAL4L/Dm} rescues between 42% to 15% of slbo- flies, rescue is almost as efficient as P{Pw15}.