14401
To determine whether the defect in the patient's T lymphocytes involved a trans-acting factor common to the affected lymphokine genes , we examined the ability of nuclear factors from the patient's T lymphocytes to bind response elements present in the regulatory region of IL2 .
 ( DNA: lymphokine genes, None) , ( DNA: genes, None) , ( protein: nuclear factors, None) , ( protein: trans-acting factor, None) , ( DNA: regulatory region, None) , ( cell type: T lymphocytes, None) , ( protein: lymphokine, None) , ( cell type: T lymphocytes, None) , ( DNA: IL2, 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:
 ( DNA: lymphokine genes, None) , ( DNA: genes, None) , ( protein: nuclear factors, None) , ( protein: trans-acting factor, None) , ( DNA: regulatory region, None) , ( cell type: T lymphocytes, None) , ( protein: lymphokine, None) , ( cell type: T lymphocytes, None) , ( DNA: IL2, None) 