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An oligonucleotide microarray with more than 15 , 000 sequences was used to assess differentially expressed hepatic mRNA levels in female eelpout collected from the contaminated area at G o teborg harbor compared to fish from a national reference site , Fj a llbacka .
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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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