3569
We here summarize evidence that thymic atrophy induced by 2,3,7,8-tetrachlorodibenzo-p-dioxin ( TCDD ) can be mediated, at least in part, by damage to extrathymic T-cell precursors in bone marrow and fetal liver .
 ( cell type: extrathymic T-cell precursors, 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: extrathymic T-cell precursors, None) 