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Therefore, any event that enables T cells to become less responsive to IFN- gamma may potentially alter immune responsiveness to Ag .
 protein: IFN- gamma; protein: Ag; cell type: T cells
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: IFN- gamma, Ag, T cells 
Answer:
 protein: IFN- gamma; protein: Ag; cell type: T cells