4107
Additionally , EERB also exerts an immunoactivatory effect on N13 microglia cells , by inducing TNF - alpha ( tumour necrosis factor - alpha ) expression , which plays a key role in the innate immune response to infection .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 None