UASt regulatory sequences drive expression of a 500bp inverted repeat.
Knockdown of BM-40-SPARC in the fat body, through expression of BM-40-SPARCNIG.6378R under the control of Scer\GAL4Cg.PA causes retention of Avic\GFPvkg-G454 in fat body cells. Avic\GFPvkg-G454 accumulates in growing extracellular fibers. These larvae lack Avic\GFPvkg-G454 in the basement membranes of other organs, such as the wing disc.