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Fas -mediated apoptosis plays an important role in regulating the immune response in peripheral T cells .
 cell type: T cells; cell type: peripheral T cells; protein: Fas
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
 Entities: T cells, peripheral T cells, Fas 
Answer:
 cell type: T cells; cell type: peripheral T cells; protein: Fas