14671
Thus, the 55 kd TNFR plays a decisive role in the host's defense against microorganisms and their pathogenic factors .
 55 kd TNFR
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:
 55 kd TNFR