9266
ATRA also induced expression of C/EBP epsilon protein in NB4 cells , as shown by Western blotting .
 NB4 cells, C/EBP epsilon 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:
 NB4 cells, C/EBP epsilon protein