13544
Furthermore , we found a significant gene - environment interaction between OGG1 Ser326Cys polymorphism and cigarette smoking in relation to male infertility risk ( Pinteration = 0 . 0003 ) .
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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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