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The 150 bp hEpoR promoter exhibited high and low activity in erythroid OCIM1 and K562 cells , respectively, reflecting the high and low levels of constitutive hEpoR expression .
 ( cell line: OCIM1, None) , ( protein: hEpoR, None) , ( DNA: 150 bp hEpoR promoter, None) , ( cell line: K562 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:
 ( cell line: OCIM1, None) , ( protein: hEpoR, None) , ( DNA: 150 bp hEpoR promoter, None) , ( cell line: K562 cells, None) 