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Microscopic image of a fruit fly brain showing several neurons specified during development of the deutocerebral-tritocerebral boundary. Jessika Bridi/Hirth Lab, King’s College London Microscopic image of a fruit fly brain showing several neurons specified during development of the deutocerebral-tritocerebral boundary, or DTB, revealed by Green Fluorescent Protein. The circuits arising from the DTB play crucial roles in the regulation of behavior.