In wild-type, neuroblast NB7-1 generates five U motoneurons. Overexpression of hbScer\UAS.T:Hsim\VP16 in hb15/hbP1only mutant NB7-1 under the control of Scer\GAL4en-e16E produces an average of six U neurons per hemisegment.
Overexpression of hbScer\UAS.T:Hsim\VP16 in embryos under the control of Scer\GAL4pros.PMG generates an average of 5.6 U neurons per hemisegment.
Overexpression of hbScer\UAS.T:Hsim\VP16 in Df(2L)ED773 mutant embryos under the control of Scer\GAL4pros.PMG does not increase the number of U neurons.