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Copper concentrations in the animals however , never were higher than 185 mu g g ( - 1 ) dry weight , independent of exposure level and pH , suggesting homeostatic regulation .
 Chemical: Copper
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: Copper