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Our data highlight the involvement of adenosine A2ARs in the mechanisms of nicotine - induced alpha 7 nAChR upregulation , and identify A2ARs as novel pharmacological targets for modulating the long - term effects of nicotine on alpha 7 receptors .
 Chemical: adenosine; Chemical: nicotine; 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: adenosine; Chemical: nicotine; Chemical: nicotine