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We previously demonstrated that both synthetic ( Exosurf ) and modified natural surfactant ( Survanta ) downregulated endotoxin-stimulated inflammatory c ytokine mRNA levels and protein products ( tumor necrosis factor-alpha [TNF], interleukin-1-beta [ IL-1 ], interleukin-6 [ IL-6 ]) in human alveolar macrophages .
 IL-6, interleukin-1-beta, interleukin-6, macrophages, IL-1, protein products, human alveolar macrophages, inflammatory c ytokine mRNA, tumor necrosis factor-alpha
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:
 IL-6, interleukin-1-beta, interleukin-6, macrophages, IL-1, protein products, human alveolar macrophages, inflammatory c ytokine mRNA, tumor necrosis factor-alpha