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As the stakeholders describe in a commentary published last month ( 339 , 1284 - 1285 , 2013 10 . 1126 / science . 1236939 ) , the goal of the initiative is to understand how thousands of neurons work in concert to control behavior and trigger disease .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
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