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Systemic administration of the alpha 7 nAChR antagonist MLA reversed PNU - 120596 ' s effects , suggesting the involvement of central and peripheral alpha 7 nAChRs .
 Chemical: MLA; Chemical: PNU - 120596
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: MLA; Chemical: PNU - 120596