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RESULTS: Both all-trans and 9-cis RA inhibited virus replication in HIV-1 IIIB-infected monocytoid cells , in the presence and absence of the co-stimulatory agent phorbol myristate acetate ( PMA ).
 HIV-1 IIIB-infected monocytoid cells
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:
 HIV-1 IIIB-infected monocytoid cells