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Fig. 5. DLL represses SER expression. (A-A’’) ptcGAL4 UASDll UASGFP early third instar leg discs. Ectopic DLL expression in the femur (arrow) results in a cell autonomous loss of SER and DAC expression. (B,B’) ptcGAL4 UASDll UASGFP results in repression of SER expression in tarsal segment 5 (arrow). (C) ptcGAL4 UASDll adult leg with tarsal segment fusions (bracket). (D-D’’) Dll Minute clone results in the cell autonomous induction of SER expression within the tarsus (arrow).