The GMR49C04 enhancer fragment followed by the Drosophila synthetic core promoter (DSCP) is fused upstream of the p65(AD)::Zip+ hemidriver (component of a 'split driver' system, contains the p65 activation domain).
Optogenetic activation (using Cnoc\ChR1Cs.IVS.20xUAS.Venus with 590 nm (red) light) of neurons targeted by the split-GAL4 pair of Scer\GAL4DBD.R72E01 and Hsap\RELAAD.R49C04 in adults significantly increases takeoff rates, compared to controls; takeoffs are shorter in duration than spontaneous takeoffs in controls.
Silencing (using Hsap\KCNJ2IVS.10xUAS.EGFP) of neurons targeted by the split-GAL4 pair of Scer\GAL4DBD.R72E01 and Hsap\RELAAD.R49C04 in adults significantly reduces overall takeoff rates and the proportion of short takeoffs in response to fast, but not slow, looming stimuli, compared to controls.