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We have found that RS cells of all histologic categories of HIV- HD consistently display the BCL-6 (-)/syn-1(+) phenotype and thus reflect post-GC B cells .
 post-GC B cells, RS cells, BCL-6
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:
 post-GC B cells, RS cells, BCL-6