Expression of ShawnScer\UAS.cSa driven by Scer\GAL4da.PU rescues lethality in Shawn1/Shawn1 or Shawn2/Shawn2 mutants and rescues ERG defects in Shawn1/Shawn1 or Shawn2/Shawn2 full mutant eye clones. Expression of ShawnScer\UAS.cSa driven by Scer\GAL4RapGAP1-OK6 rescues increases in EJC amplitude at the NMJ of Shawn1/Shawn2 third instar larvae.