23671
The highest levels of adducts occurred in liver , followed by urinary bladder , and then in cecum and colon ; lower DNA adduct levels were formed in the lung and pancreas following 12 weeks of feeding .
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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:
 None