Expression of endoASSQ.Scer\UAS using Scer\GAL4elav-C155 rescues endoAΔ4 larval lethality to adulthood, although the adult rescuants cannot fly and have reduced locomotor activity, and they have a median survival time of only 2.3 days. This genotype does rescue the severe tetanus-induced depression in excitatory junctional potentials (EJPs), the slow post-tetanic recovery of EJP amplitude, and the low frequency of spontaneous miniature EJPs seen in endoAΔ4 mutants.