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First is an expansion phase prior to TCR rearrangement , which appears to be correlated with programming of at least some response genes for inducibility.
 protein: TCR
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:
 protein: TCR