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An acute toxicological experiment was designed to characterize the sequence of renal ultrastructural changes with accumulated MCs in crucian carp injected intraperitoneally ( i . p . ) with extracted microcystins ( mainly MC - RR and - LR ) at two doses , 50 and 200 mu g MC - LReq . kg ( - 1 ) body weight .
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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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