1153
Hemoglobin switching in humans is accompanied by changes in the ratio of the transcription factors , GATA-1 and SP1 .
 ( protein: GATA-1, None) , ( protein: Hemoglobin, None) , ( protein: transcription factors, None) , ( protein: SP1, 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: GATA-1, None) , ( protein: Hemoglobin, None) , ( protein: transcription factors, None) , ( protein: SP1, None) 