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In this study , we compared the effects of the alpha 7 - selective agonist ( PNU - 282987 ) and PAM ( PNU - 120596 ) in a variety of behavioral tests in Sprague Dawley rats to look at their effects on learning and memory as well as anxiety .
 Chemical: PNU - 282987; 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: PNU - 282987; Chemical: PNU - 120596