Fig 7. Transcriptional inputs required for proper photoreceptor targeting in the Drosophila visual system.

Summary of the transcription factors that regulate column- and layer-specific targeting of the R1-6 and R7 and R8 photoreceptors. Predicted indirect regulation is shown with a double arrowhead (Sens binds directly on the caps promoter). Although all of the currently known transcriptional regulators (i.e., seq, sens and otd) are presented, for clarity, only those CAMs and adhesion molecules most relevant to our findings are shown here.