5352
After they are released , they activate kappa opioid receptors distributed throughout the brain and spinal cord , where they trigger cellular responses resulting in different stress responses : analgesia , dysphoria - like behaviors , anxiety - like responses , and increased addiction behaviors in experimental animals .
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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