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Fig. 7. Expression of Rac1 increases dendritic branching of DA neurons in Drosophila larvae. (A) Dendritic branching pattern of dorsal cluster DA neurons in wild-type third instar larvae. (B) Increased dendritic branching when Rac1 is overexpressed in DA neurons. (C,D) Enlarged images of dendrites in A,B, respectively. (E) Reduced dendritic branching when Fmr1 is overexpressed in dorsal cluster DA neurons. (F) Reduced dendritic branching caused by Fmr1 overexpression (E) can be partially reversed by expression of Rac1. Scale bars: 40 µm.