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Recently, we have reported that the histogenesis of HD of the general population may be assessed by monitoring the expression pattern of BCL-6 , a transcription factor expressed in germinal center (GC) B cells , and of CD138/syndecan-1 ( syn-1 ), a proteoglycan associated with post-GC, terminal B-cell differentiation .
 BCL-6, syn-1, B-cell, CD138/syndecan-1, germinal center (GC) B cells, transcription factor
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:
 BCL-6, syn-1, B-cell, CD138/syndecan-1, germinal center (GC) B cells, transcription factor