The P{EPgy2}paraEY08038 insertion and the parabss1 mutation have been brought together in cis on the same chromosome. The mutated parabss1 gene can be overexpressed from the Scer\UAS regulatory sequences present in the P{EPgy2}paraEY08038 insertion using a Scer\GAL4 driver.
Flies carrying parabss1:EY08038 (P{EPgy2}paraEY08038 and parabss1 in cis), in which the mutant "bss1" form of para is being expressed under the control of Scer\GAL4elav-C155 have a more severe bang sensitive phenotype (longer mean recovery time) than flies carrying P{EPgy2}paraEY08038 and parabss1 in trans and expressing paraEY08038 under the control of Scer\GAL4elav-C155.