Mutation truncates the protein 14 amino acids early (stop codon replaces residue Q127).
Imaginal discs from larvae expressing His2AvtCT in a His2Av810 background have significantly more radiation-induced apoptotic cells than do discs from control larvae expressing His2Av+t4.0 in a His2Av810 background. This increase in radiation-induced apoptosis does not result in an increase in lethality. In the absence of radiation, both types of imaginal discs have a similar number of apoptotic cells.