17829
Because of the apparent role of the alpha 3 beta 4 * nAChR subtype in nicotine dependence , the goal of the current study was to better evaluate the involvement of this subtype in nicotine mediated behavioral responses .
 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: nicotine; Chemical: nicotine