2362
Maize grain from GM or non - GM isogenic control lines were separately formulated into rodent diets at concentrations of 12 . 5 % ( low level ) , 25 % ( middle level ) , and 50 % ( high level ) .
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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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