A 2880 base pair fragment from the flanking non-coding or intronic region of twi is fused upstream of a Drosophila core synthetic promoter (DSCP) followed by sequence encoding a lexA::p65 driver. The driver sequence has been optimized for Drosophila codon usage. An Hsp70 transcriptional terminator is present.
Activation of Ecol\lexAGMR16E11 neurons evokes rolling behavior in around 36% of larvae.
Although alleles from the Janelia Farm lexA driver collection incorporate the same enhancer fragments used to create the Janelia Farm GAL4 driver alleles (GMR_Brain_exp_1), significant differences are frequently observed in the expression pattern of a given enhancer fragment inserted in the P{CaryP}attP40 or other docking site compared to the same fragment inserted in the P{CaryP}attP2 docking site. Generally the Ecol\lexA patterns are subsets of the Scer\GAL4 patterns.