2071
There remains the physiological problem - - one which has always been foremost in Moruzzi ' s thinking about the intrinsic regulation of brain activity - - of how the separate actions of the different arousal systems are brought together into a functional whole .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: GENE 
Text: {0} 
Answer:
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