26274
RATIONALE : To improve outcomes for patients undergoing extinction - based therapies ( e . g . , exposure therapy ) for anxiety disorders such as post - traumatic stress disorder ( PTSD ) , there has been interest in identifying pharmaceutical compounds that might facilitate fear extinction learning and recall .
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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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