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Previously nicotine , which activates both alpha 7 and non - alpha 7 subtypes of nAChRs , has been shown to have an anxiogenic effect in behavioral tests .
 Chemical: nicotine
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: nicotine