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More is known regarding signal transduction events that occur after ligation of the T-cell antigen receptor ( TCR ).
 protein: T-cell antigen receptor; protein: TCR
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: T-cell antigen receptor, TCR 
Answer:
 protein: T-cell antigen receptor; protein: TCR