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The Section on Neuronal Connectivity, headed by Chi-Hon Lee, investigates the development and function of visual circuits in Drosophila. Using novel imaging techniques, his group characterized dendritic patterns of optic lobe neurons and derived type-specific attributes. The group revealed that TGF-beta/Activin signaling regulates the development of dendritic branches. To investigate visual information processing, the group developed a single-cell transcript profiling technique for determining the usage of neurotransmitters and receptors in optic lobe neurons.