9585
Differences in the number of embryos developing normally after in vitro fertilizations of oocytes fertilized with sperm from exposed males and non - exposed males showed that sperm were more susceptible to toxicity , but oocytes were also affected at the highest concentration .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
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