11912
Thus, NF-kappa B , a potent transcriptional activator of HIV expression , is also involved in the expression of RANTES , a chemokine that blocks infection by macrophage-tropic strains of HIV .
 chemokine, RANTES, NF-kappa B
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:
 chemokine, RANTES, NF-kappa B