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Monoallelic expression of TAL1 was observed in the leukemic cells of all patients (8 of 8) bearing a TAL1 gene rearrangement .
 ( cell type: leukemic cells, None) , ( protein: TAL1, None) , ( DNA: TAL1 gene, None) , ( protein: TAL1, 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: leukemic cells, None) , ( protein: TAL1, None) , ( DNA: TAL1 gene, None) , ( protein: TAL1, None) 