12910
Hanging drop-mediated transfer into 2-deoxyguanosine-treated thymus lobes showed that lymphoid progenitor cells rather than thymus stromal cells were responsible for abnormal B cell development in tg epsilon26 thymus , and that tg epsilon26 fetal liver cells were destined to become B cells in normal thymus even in the presence of normal progenitor cells undergoing T cell development .
 ( cell type: normal progenitor cells, None) , ( cell type: lymphoid progenitor cells, None) , ( cell type: tg epsilon26 fetal liver cells, None) , ( protein: tg epsilon26, None) , ( cell type: B cells, None) , ( protein: tg epsilon26, 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: normal progenitor cells, None) , ( cell type: lymphoid progenitor cells, None) , ( cell type: tg epsilon26 fetal liver cells, None) , ( protein: tg epsilon26, None) , ( cell type: B cells, None) , ( protein: tg epsilon26, None) 