Credit: Courtesy of Jean Livet

This image is one of the first to depict, in neuron-by-neuron detail, the tangled circuits that collect, process, and archive information in the mammal brain. It shows individu­al mouse neurons--specifically, the axons from a nerve that controls eye movements--fluorescing in different colors. Such images could help researchers better understand everything from brain development to the workings of diseases like autism and schizophrenia.

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