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Rheumatoid arthritis ( RA ) is a chronic autoimmune inflammatory disease in which unknown arthrogenic autoantigen is presented to CD4 + T cells .
 arthrogenic autoantigen, CD4, CD4 + T cells
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:
 arthrogenic autoantigen, CD4, CD4 + T cells