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Interestingly , quercetin ( QU ) dose dependently prevented Ni ( 2 + ) - induced cell proliferation arrest and death from 0 to 80 mu M but showed similar activity of scavenging ROS at the concentrations of 20 , 40 and 80 micro M .
 Chemical: quercetin; Chemical: Ni ( 2 + )
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: quercetin; Chemical: Ni ( 2 + )