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We overexpressed AML1a (without the transcription-activating domain ) and AML1b (with the domain) proteins in K562 leukemia cells , which can be induced to differentiate into hemoglobin-producing cells and megakaryocytes .
 ( protein: transcription-activating domain, None) , ( protein: AML1a, None) , ( cell type: hemoglobin-producing cells, None) , ( protein: AML1b, None) , ( cell type: megakaryocytes, None) , ( cell type: K562 leukemia 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:
 ( protein: transcription-activating domain, None) , ( protein: AML1a, None) , ( cell type: hemoglobin-producing cells, None) , ( protein: AML1b, None) , ( cell type: megakaryocytes, None) , ( cell type: K562 leukemia cells, None) 