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Forty-one HD samples (19 NLPHD , 12 nodular sclerosis , and 10 mixed cellularity) were immunostained with the monoclonal antibodies PG-B6 and PG-B6p that react with a fixative-sensitive and a formalin-resistant epitope on the aminoterminal region of the BCL-6 gene product , respectively.
 PG-B6, BCL-6 gene product, aminoterminal region, PG-B6p, formalin-resistant epitope, monoclonal antibodies, 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:
 PG-B6, BCL-6 gene product, aminoterminal region, PG-B6p, formalin-resistant epitope, monoclonal antibodies, BCL-6