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The present data, along with other findings of HPA abnormalities in PTSD , support the possibility of a greater negative feedback sensitivity at one or more levels of the HPA axis .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
Answer:
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