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The differentiation of T cells into functionally diverse subpopulations is controlled in part, by transcriptional activation and silencing ; however, little is known in detail about the proteins that influence this developmental process .
 cell type: T cells
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: T cells