12093
Furthermore, Ikaros-null thymocytes hyperproliferate in response to T cell receptor ( TCR ) signaling ; within days after their appearance in the thymus , clonally expanding populations are detected.
 cell type: Ikaros-null thymocytes; protein: T cell 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: Ikaros-null thymocytes, T cell receptor, TCR 
Answer:
 cell type: Ikaros-null thymocytes; protein: T cell receptor; protein: TCR