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Using electrophoretic mobility shift assays , we have studied these transcription factors in primary T cells from human blood to verify their presence in a physiologic setting and to identify the signals that stimulate factor activity .
 cell type: primary T cells; protein: transcription factors
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:
 cell type: primary T cells; protein: transcription factors