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Propranolol administration ( 5 mg / kg for 3 weeks ) to 6 - month - old SAMP8 mice attenuated cognitive memory impairments shown by these mice in the novel object recognition test .
 Chemical: Propranolol
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: Propranolol