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; protein: Steel factor; protein: SCL; protein: Steel; RNA: SCL mRNA; protein: SCL protein
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
 Entities: SCL, Steel factor, SCL, Steel, SCL mRNA, SCL protein 
Answer:
 protein: SCL; protein: Steel factor; protein: SCL; protein: Steel; RNA: SCL mRNA; protein: SCL protein