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In the presence of Epo , c-myb mRNA declined and 20% of K562 cells synthesized Hb regardless of antisense myb RNA expression.
 ( protein: Epo, None) , ( protein: Hb, None) , ( RNA: c-myb mRNA, None) , ( cell line: K562 cells, None) , ( RNA: antisense myb RNA, 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:
 ( protein: Epo, None) , ( protein: Hb, None) , ( RNA: c-myb mRNA, None) , ( cell line: K562 cells, None) , ( RNA: antisense myb RNA, None) 