(A) Confocal images of muscle 4 NMJ synapses co-stained with anti-CSP (magenta) and anti-HRP (green) to reveal synaptic vesicles and presynaptic membrane, respectively. In ube3a tkv double mutants, bouton numbers were similar to those of tkv8/tkvK16713 single mutants. One copy of tkv8 rescued the synapse overgrowth in ube3a35 mutants. Scale bar = 10 μm. (B, C) Quantification of total bouton number (B) and satellite bouton number (C) of various genotypes including wild type, ube3a35, tkv8/tkvK16713, tkv8/ tkvK16713; ube3a35, tkv8/+, tkv8/+; ube3a35, mad12/+, mad12/+; ube3a35. n ≥ 18 NMJ terminals, one-way ANOVA test, ***P < 0.001, ns, not significant,. Error bars represent SEM.