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In this study, we used the T-cell-activating superantigen staphylococcal enterotoxin A ( SEA ) to investigate molecular mechanisms of T-lymphocyte anergy in vivo.
 staphylococcal enterotoxin A, SEA, T-cell-activating superantigen
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:
 staphylococcal enterotoxin A, SEA, T-cell-activating superantigen