1525
SCL protein levels in BFU-E -derived cells were highest in day 7 cells and decreased progressively from day 7 to day 14 of culture, suggesting an association of SCL with erythroid proliferation .
 ( protein: SCL, None) , ( cell line: BFU-E -derived cells, None) , ( protein: SCL protein, None) , ( cell type: BFU-E, 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: SCL, None) , ( cell line: BFU-E -derived cells, None) , ( protein: SCL protein, None) , ( cell type: BFU-E, None) 