26282
RESULTS : Relative to placebo , the OT group showed increased fear - potentiated startle responding during the earliest stage of extinction training relative to placebo ; however , all treatment groups showed the same level of reduced responding by the end of extinction training .
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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:
 None