2204
Northern blot analysis of poly(A) RNA purified from the human B cell line RPMI 8226 and from activated T cells revealed a major mRNA transcript of 2.2 kilobases .
 ( RNA: poly(A) RNA, None) , ( RNA: major mRNA transcript, None) , ( cell line: human B cell line RPMI 8226, None) , ( cell type: activated T cells, 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:
 ( RNA: poly(A) RNA, None) , ( RNA: major mRNA transcript, None) , ( cell line: human B cell line RPMI 8226, None) , ( cell type: activated T cells, None) 