1531
SCL mRNA levels assessed by Northern blot in day 7 cells did not increase significantly in response to Steel factor stimulation, suggesting that posttranscriptional mechanisms may also be important in the increase in SCL protein observed in response to Steel .
 ( protein: SCL, None) , ( protein: Steel factor, None) , ( protein: SCL, None) , ( protein: Steel, None) , ( RNA: SCL mRNA, None) , ( protein: SCL protein, 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) , ( protein: Steel factor, None) , ( protein: SCL, None) , ( protein: Steel, None) , ( RNA: SCL mRNA, None) , ( protein: SCL protein, None) 