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The human tumor necrosis factor alpha ( TNF-alpha ) gene is one of the earliest genes transcribed after the stimulation of a B cell through its antigen receptor or via the CD-40 pathway .
 human tumor necrosis factor alpha, antigen receptor, B cell, TNF-alpha, human tumor necrosis factor alpha ( TNF-alpha ) gene
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:
 human tumor necrosis factor alpha, antigen receptor, B cell, TNF-alpha, human tumor necrosis factor alpha ( TNF-alpha ) gene