24639
Ultrastructural changes in the kidney of crucian carp progressed with increasing accumulated MCs and exposure times within 48 h post - injection , whereas renal ultrastructural recovery of crucian carp in the 50 mu g MC - LReq . kg ( - 1 ) dose group was evident at 168 h post - injection .
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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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