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By immunohistochemistry , p50 protein was detected in the cytoplasm and nucleus of FDC , confirming the involvement of FDC .
 FDC, FDC, p50
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:
 FDC, FDC, p50