1537
C/EBP beta activated the TNF alpha gene promoter in cotransfection assays and bound to it at a site which failed to bind the closely related protein C/EBP alpha .
 TNF alpha, C/EBP beta, TNF alpha gene promoter, C/EBP alpha
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:
 TNF alpha, C/EBP beta, TNF alpha gene promoter, C/EBP alpha