12909
The accumulation of mature B cells in the thymus was found only in tg epsilon26 mice, not in other human CD3epsilon transgenic mouse lines or other T cell-deficient mice , including CD3-epsilon knockout mice and TCR-beta/TCR-delta double knockout mice .
 ( cell type: mature B cells, None) , ( cell line: human CD3epsilon transgenic mouse lines, 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: mature B cells, None) , ( cell line: human CD3epsilon transgenic mouse lines, None) 