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When the effect of QU on histone acetylation was studied , QU significantly prevented Ni ( 2 + ) - induced histone hypoacetylation at 40 or 80 micro M .
 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: Ni ( 2 + )