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BTBR mice paired with BTBR cage - mates in the habituation session modestly ameliorated their performance in the object recognition test but co - learning with a familiar C57BL / 6J mouse completely normalized episodic memory deficit .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
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