The VT013121 enhancer fragment followed by the Drosophila synthetic core promoter (DSCP) is fused upstream of the GAL4(DBD)::Zip- hemidriver (component of the 'Split GAL4' system, contains the GAL4 DNA-binding domain).
Comment: when combined with P{VT049749-p65.AD} (combination referred to as 'SS02542')
Acute optogenetic activation (using Cnoc\ChR1::Csub\ChRCsChrimson.IVS.20xUAS.Venus with 627 nm (red) light) of neurons targeted by the split-GAL4 pair of Scer\GAL4DBD.VT013121 and Hsap\RELAAD.VT049749 induces freezing behavior with anterior twitches of the front legs at the beginning and end of activation, unlike controls.