Expression of fweRB.Scer\UAS.T:Ivir\HA1.T:Zzzz\FLAG under the control of Scer\GAL4nSyb.PS or Scer\GAL4elav.PU completely rescues the Clathrin-mediated endocytosis defects, and when expressed under the control of Scer\GAL4nSyb.PS, rescues the activity-dependent bulk endocytosis and lowered synaptic vesicle numbers and the increased vesicle size seen in larval neuromuscular junctions of fweDB25/fweDB56 mutants.