6461
The presence of C/EBP beta was confirmed by immunohistochemistry and Western blot analysis with isolated synovial fibroblasts .
 C/EBP beta, synovial fibroblasts
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:
 C/EBP beta, synovial fibroblasts