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We compared gene expression of neuroinflammatory markers ( study 1 ) ; and microglial mean cell body volume and mean cell body number in dentate gyrus , and dentate gyrus volume ( study 2 ) .
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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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