UASt regulatory sequences drive expression of ems in which the YPWL amino acid motif that forms the core of the hexapeptide motif has been mutated to AAAL.
Expression of ems-hp.Scer\UAS under the control of Scer\GAL4sca-537.4 significantly rescues the embryonic brain defects and the "open-head" ectoderm defects of ems2 mutants.