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Exposure to Cu NPs decreased cell viability to 73 % ( p < 0 . 01 ) and significantly ( p < 0 . 05 ) elevated levels of lactate dehydrogenase , intracellular reactive oxygen species and interleukin - 8 that mirrored our findings from subacute in vivo inhalation studies in mice .
 Chemical: Cu; Chemical: lactate; Chemical: oxygen
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: lactate; Chemical: oxygen