950
In order to investigate the expression and function of mGlu5 receptors in an animal model for treatment - resistant depression we used rats bred for congenital learned helplessness ( cLH ) and the control strain , bred for resistance against inescapable stress , congenitally . not learned helpless rats ( cNLH ) .
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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