3354
Studies of cell lines representing endocrine , fibroblast , and lymphoid lineages using polyclonal antisera to detect E2A proteins have suggested that significant E2A protein expression is restricted to B-lymphocytes .
 ( cell line: cell lines, None) , ( protein: E2A protein, None) , ( protein: E2A proteins, None) , ( cell type: B-lymphocytes, 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 line: cell lines, None) , ( protein: E2A protein, None) , ( protein: E2A proteins, None) , ( cell type: B-lymphocytes, None) 