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, None) , ( protein: T cell receptor, None) , ( protein: TCR, None) 
Locate the role in the text that participated in the event based on the event type and return it in the event list. 
 Option: Event type: RNA,cell type,protein,cell line,DNA, Arguments type: . 
Text: {0} 
Answer:
 ( cell type: Ikaros-null thymocytes, None) , ( protein: T cell receptor, None) , ( protein: TCR, None) 