By analyzing 203 distinct brain areas over 15,000 thin sections of tissue, they precisely mapped where these genes are active, down to the level of individual cells.

通过对超过一万五千细薄的组织切片上的203个不同的大脑区域的分析，他们准确地画出了这些基因活动区域地图并（使之）精确到个体细胞水平。

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Previous efforts to document neural wiring usually required samples of brain tissue to be sliced into hundreds or thousands of thin sections and then painstakingly reconstructed.

WSJ: Brain Science: Mysterious Neural Circuitry Becomes Viewable