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Quantitative autoradiography was used to measure cytisine - sensitive [ ( 125 ) I ] epibatidine and [ ( 125 ) I ] alpha - bungarotoxin binding to alpha 4 beta 2 * and alpha 7 nAChRs , respectively , in brain sections of drug - na i ve ( n = 6 ) or nicotine treated ( n = 5 - 7 ) , wild - type and adenosine A2AR knockout mice .
 Chemical: cytisine; Chemical: [ ( 125 ) I ] epibatidine; Chemical: ( 125 ) I; Chemical: nicotine; Chemical: adenosine
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: cytisine; Chemical: [ ( 125 ) I ] epibatidine; Chemical: ( 125 ) I; Chemical: nicotine; Chemical: adenosine