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Detection of endogenous dopamine in adult fruit fly brain. a) Microscopy image of adult brain with the 3D-printed nanoelectrode and a micropipette loaded with acetylcholine. b) False color plot of dopamine detected after acetylcholine (2 pmol) stimulation. c) Current response over time for dopamine during stimulation. d) Cyclic voltammogram of the stimulated dopamine.
