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Though alpha 7 agonists were recently found to possess antinociceptive and anti - inflammatory properties in rodent models of chronic neuropathic pain and inflammation , the effects of alpha 7 nAChRs PAMs on chronic pain and inflammation remain largely unknown .
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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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