21051
Analysis of MC - LR and MC - RR in tissue from freshwater fish ( Tinca tinca ) and crayfish ( Procambarus clarkii ) in tench ponds ( C a ceres , Spain ) by liquid chromatography - mass spectrometry ( LC - MS ) .
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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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