25842
Relative to bred low - responder ( bLR ) rats , bred high - responder ( bHR ) rats exhibit increased exploratory behavior , are more impulsive , more aggressive , seek stimuli associated with rewards , and show a greater tendency to relapse .
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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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