3427
The toxicity of copper to the collembolan Folsomia fimetaria L . was studied in soil incubated with copper sulfate for different periods before the introduction of collembolans , to assess the effect of aging of contamination on the toxicity of copper .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: GENE 
Text: {0} 
Answer:
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