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Whole body biochemical assays such as TUNEL - and BrdU - assay will provide a better understanding of cellular responses such as apoptosis and cell death upon cytotoxic exposure of copper in T . japonicus .
 Chemical: BrdU; 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: BrdU; Chemical: copper