1616
We conclude that Cu exposure of human lung - and liver - derived cells should be considered a reliable experimental system for detailed study of mechanism / mechanisms by which Cu overload exerts its deleterious effects .
 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: Cu; Chemical: Cu