8913
Such abnormal behaviors were tightly correlated to up - regulated orexin receptor ( ORXR ) mRNA expression levels in some brain areas such as the lateral thalamic nucleus ( + 213 % ) and the optic tectum ( + 90 % ) with respect to controls .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 None