14381
To evaluate toxicity under field conditions such as fluctuating and pulsed exposures , process - based toxicokinetic / toxicodynamic ( TK / TD ) models may be used for extrapolation from the existing evidence .
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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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