1979
The present study suggests a role for the influence of copper by low concentrations of DEDTC in the extracellular media , the absorption and accumulation of copper in the cell and apoptotic events , induced by the cytotoxic effects that occur when DEDTC forms a complex with the copper ions .
 Chemical: copper; Chemical: DEDTC; Chemical: copper; Chemical: DEDTC; 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; Chemical: DEDTC; Chemical: copper; Chemical: DEDTC; Chemical: copper