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The intensity of C/EBP beta staining was greater (P < 0.001) in synovial fluid monocytes than in those from normal or rheumatoid peripheral blood .
 C/EBP beta, synovial fluid monocytes
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 fluid monocytes