16638
Expressions of NR2B and nAChR beta 2 were significantly increased ( 17 % and 6 . 70 % , respectively ) , whereas expression of nAChR alpha 4 was significantly decreased ( 5 . 67 % ) in male experimental group compared to the male control group ( p < 0 . 05 ) .
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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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