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Chronic exposure to oxyfluorfen led to slight variations in AEA , however , the ranges of variability of AEA in controls and exposed communities were similar , highlighting the difficulty of a direct interpretation of AEA values .
 oxyfluorfen
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 oxyfluorfen