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We investigated serotonergic modulation of behavior and presynaptic serotonergic function in adult ( 67 - 74 days old ) and adolescent ( 28 - 34 days old ) male rats .
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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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