A - G The indicated UAS-tsr constructs were tested for their ability to suppress pruning defects induced by PP2A-29B dsRNA expression. Suppression tests were performed as in Figure 2. Panels A - C show effects of the expression of wild type or phosphomutant tsr variants on dendrite pruning, panels D - G show neurons coexpressing PP2A-29B dsRNA. (A, E) C4da neuron (co-) overexpressing wild type tsr. (B, F) C4da neuron (co-) overexpressing tsr S3A. (C, G) C4da neuron (co-) overexpressing tsr S3E. The arrow in panel G denotes a characteristic varicosity at the tip of an unpruned dendrite. (D) C4da neuron co-expressing PP2A-29B dsRNA and lacZ as a UAS titration control.