The lethality of Nc73EFMI06026-TG4.1 mutants can be rescued by expression of Nc73EFScer\UAS.T:Zzzz\FLAG under the control of Scer\GAL4Nc73EF-MI06026-TG4.1 (= inherent Gal4 in the Nc73EFMI06026-TG4.1 allele). Co-expression of Nc73EFScer\UAS.T:Zzzz\FLAG also significantly improves the loss of synaptic transmission in photoreceptor cells (measured by electroretinogram) induced by Scer\GAL4ninaE.PU-driven expression of Nc73EFGD4760.