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There was, however, a significant difference in the amounts of the nuclear protein , REF-1 (which regulates AP-1 DNA binding by altering the redox status of FOS and JUN proteins ), in alveolar macrophages compared with monocytes .
 nuclear protein, JUN proteins, AP-1, alveolar macrophages, REF-1, FOS, 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:
 nuclear protein, JUN proteins, AP-1, alveolar macrophages, REF-1, FOS, monocytes