Expression of a GAL4 driver is governed by the B4.5 enhancer of B-H1 and the S8 enhancer of B-H2.
Scer\GAL4B-H1.B4.5.B-H2.S8/B-H2UAS.cSa partially rescues Df(1)BH2
B-H1UAS.cSa/Scer\GAL4B-H1.B4.5.B-H2.S8 partially rescues Df(1)BH2