6131
For the first time , we evaluated the effects of exposure to the 2450MHz Wi - Fi signal ( 1h / day , 6days / week ) on the reproductive system of male and female Wistar rats , pre - exposed to Wi - Fi during sexual maturation .
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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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