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In the present study we investigated the possible involvement of the mitogen-activated protein kinase family members extracellular-regulated kinase 1/2 ( ERK1/2 ) and c- Jun N-terminal kinase ( JNK ) in mediating IL-6 gene expression in human monocytes , in particular their role in enhancing NF-kappa B activity .
 ERK1/2, extracellular-regulated kinase 1/2, IL-6, JNK, Jun N-terminal kinase, NF-kappa B, mitogen-activated protein kinase family, human monocytes
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:
 ERK1/2, extracellular-regulated kinase 1/2, IL-6, JNK, Jun N-terminal kinase, NF-kappa B, mitogen-activated protein kinase family, human monocytes