8587
To fully understand the evolutionary implications of pollutants on eel reproductive fitness , analyses of mature migrating eels and the characterization of their transcriptome - wide gene transcription response would be appropriate to unveil the complex responses associated with multiple interacting stressors and the long - term consequences at the entire species level .
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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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