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Prevention of cytotoxicity of nickel by quercetin : the role of reactive oxygen species and histone acetylation .
 Chemical: nickel; Chemical: quercetin; 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: nickel; Chemical: quercetin; Chemical: oxygen