13407
We have found that in nodular lymphocyte predominance HD ( NLPHD ) tumor cells consistently display the BCL-6 (+)/ syn-1 (-) phenotype , indicating their derivation from GC B cells .
 BCL-6, tumor cells, GC B cells, syn-1
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, tumor cells, GC B cells, syn-1