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These findings suggest that environmental pesticide exposure impacts the placenta by increasing the expression frequency of the anti - inflammatory cytokine IL - 13 , which may be related to the up - regulation of enzymes implicated in tissue repair .
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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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