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The positive effect of the drug combination appeared to be alpha 7 - nAChR mediated given that it was blocked in the NOR task by the selective alpha 7 - nAChR antagonist methyllycaconitine ( MLA ) .
 Chemical: methyllycaconitine; Chemical: MLA
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: methyllycaconitine; Chemical: MLA