UASt regulatory sequences drive expression of two miRNA hairpins that each consist of a mir-6-1 precursor in which the 22bp corresponding to mature mir-6-1 have been replaced by sequences perfectly complementary to ctrip. The two hairpins target different regions of the ctrip gene. The target sites in ctrip are "CG17735-1" (5'-CAACGTCGTCTTAACCATAACT-3') and "CG17735-2" (5'-CAAGCGCGTGTCATACTAAATT-3').