UASt regulatory sequences drive expression of a 500bp inverted repeat.
Expression of CG16884NIG.16884R under the control of Scer\GAL4ptc-559.1 narrows the L3-L4 intervein region and reduces the anterior crossvein. The anterior crossvein is not ablated, although small gaps are seen in some wings. Expression of CG16884NIG.16884R under the control of Scer\GAL4C-765 results in slightly small wings with some ectopic vein formation, especially in the position of the anterior and posterior crossveins. A reduction in size is also seen when CG16884NIG.16884R is expressed under the control of Scer\GAL4en-e16E. The reduction affects the posterior compartment causing a posterior curvature of the wing. Defects in cuticle formation are also seen. The cuticle of the entire posterior department appears fragile and less pigmented.