15770
Histopathological changes were more severe and diverse in groups 80 and 100 mg kg ( - 1 ) day ( - 1 ) , and the least significant change was observed in groups 40 and 60 mg kg ( - 1 ) day ( - 1 ) .
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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