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In contrast, SCL mRNA levels did not decrease significantly between day 7 and day 14 cells, suggesting that posttranscriptional mechanisms are largely responsible for the decrease in SCL protein observed.
 SCL, SCL mRNA, SCL, SCL protein
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
Answer:
 SCL, SCL mRNA, SCL, SCL protein