6295
Many environmental factors, in particular, proinflammatory cytokines and growth factors , can exert regulatory effects on MSR expression , whereas intracellular accumulation of cholesterol itself does not influence MSR levels to any considerable extent.
 MSR, proinflammatory cytokines, growth factors, MSR
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:
 MSR, proinflammatory cytokines, growth factors, MSR