5159
The present paper is a comprehensive review on the state of art of the 5 - HT6 receptors , while highlighting the potential clinical applications of 5 - HT6 receptor agonists / antagonists .
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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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