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Baseline copper ( Cu ) level , Cu uptake , and Cu cytotoxicity were also reduced in CLDN3KD and CLDN4KD cells .
 Chemical: copper; Chemical: Cu; Chemical: Cu; Chemical: Cu
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; Chemical: Cu; Chemical: Cu; Chemical: Cu