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This prompted us to investigate the expression of the BCL-6 protein in Hodgkin's disease ( HD ), focusing on the nodular lymphocyte predominance subtype ( NLPHD ), which differs from classical HD by virtue of the B-cell nature of the malignant cell population (so-called L&H cells ) and its relationship with germinal centers.
 BCL-6, L&H cells, BCL-6 protein, malignant cell population
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, L&H cells, BCL-6 protein, malignant cell population