Unexpected glutamatergic excitatory axon terminals (dark green) from the ventral tegmental area make synaptic contacts on a dendrite of a parvalbumin neuron (magenta) involved in aversion. From art view, all kind of cellular organelle at ultrastructural level look like diverse groups of sea animals sadly jumping out of the contaminated river. They are not happy and rewarding! Image by Shiliang (Steven) Zhang (NIH/NIDA)