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Dimethylphosphate and dimethyldithiophosphate exclusively detected in all treated groups can be used as early , sensitive biomarkers for exposure to a mixture of the OP pesticides .
 Chemical: Dimethylphosphate; Chemical: dimethyldithiophosphate
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: Dimethylphosphate; Chemical: dimethyldithiophosphate