2044
DNT is often investigated in a traditional manner ( in vivo using large numbers of experimental animals ) , whereas development of in vitro methods for DNT reduces animal use and increases insight into cellular and molecular mechanisms of DNT .
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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