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We investigated the functional role of Itk , a member of the cytoplasmic tyrosine kinase Tec family , in T cell activation .
 cytoplasmic tyrosine kinase Tec family, Itk
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
Answer:
 cytoplasmic tyrosine kinase Tec family, Itk