A 367 base pair fragment from the flanking non-coding or intronic region of trp is fused upstream of a Drosophila core synthetic promoter (DSCP) that is followed by sequence encoding a GAL4 driver.
Activation of Capa-positive neurons by the expression of TrpA1UAS.(B).cKa under the control of Scer\GAL4GMR21E06 leads to show shorter gut transit time, as well as less concentrated, larger and more abundant fecal deposits.