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Negative selection in the cortex appears to be a suicidal inversion of antigen responsiveness : instead of turning on IL-2 expression , the activated cell destroys its own chromatin .
 DNA: chromatin; cell type: activated cell; protein: IL-2
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
Answer:
 DNA: chromatin; cell type: activated cell; protein: IL-2