6461
The presence of C/EBP beta was confirmed by immunohistochemistry and Western blot analysis with isolated synovial fibroblasts .
 ( protein: C/EBP beta, None) , ( cell type: synovial fibroblasts, None) 
Locate the role in the text that participated in the event based on the event type and return it in the event list. 
 Option: Event type: RNA,cell type,protein,cell line,DNA, Arguments type: . 
Text: {0} 
Answer:
 ( protein: C/EBP beta, None) , ( cell type: synovial fibroblasts, None) 