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G28-5 IgG partially blocked, whereas G28-5 sFv augmented CD40 responses during stimulation with natural ligand ( gp39-CD8 fusion protein ).
 G28-5 IgG, G28-5 sFv, natural ligand, CD40, gp39-CD8 fusion protein
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:
 G28-5 IgG, G28-5 sFv, natural ligand, CD40, gp39-CD8 fusion protein