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We studied the role of the immediate early gene c-jun in cell proliferation and phorbol 12-myristate 13-acetate ( PMA )-induced differentiation in U937 human monoblastic cells , using c-jun -specific antisense (AS) phosphorothioate oligonucleotides .
 c-jun, c-jun, immediate early gene, U937 human monoblastic 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:
 c-jun, c-jun, immediate early gene, U937 human monoblastic cells