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In - depth analysis revealed that AMPH increased the number and decreased the duration of sniffing bouts in BTBR , suggesting BTBR treated with AMPH mostly engaged in brief sniffs rather than true social interactions with the novel mouse during the social approach task .
 Chemical: AMPH; Chemical: AMPH
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: AMPH; Chemical: AMPH