Contained within a 15.3kb genomic fragment including entire 3.4kb stg transcription unit.
Imaginal disc cells that are homozygous for stg2 divide only once, producing 2-celled clones that are eliminated by cell competition. This phenotype is rescued by stgBCD; stg2 cells in the imaginal disc carrying one of these transgenes divide many times and produce large clones of cells. The clones are smaller than their wild-type sister clones and show increased cell size.
Rescues some but not all mitotic domains of stg null mutants.