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Similarly , neither whole - body Na nor LPO changed in the Cu - pre - exposed fish during the 8h of the exposure to 150 mu g / L Cu - while both decreased significantly in the control fish .
 Na, Cu, Cu
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 Na, Cu, Cu