UASt regulatory sequences drive expression of an inverted repeat.
The expression of snRNP-U1-CKK101325 under the control of Scer\GAL4insc-Mz1407 leads to a severe decrease in the number of type II neuroblast lineage cells; expression for 2.5 days during the larval stage (temporally regulated by Gal80[ts]) also leads to a decrease in the number of type II neuroblast lineage cells.