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During studies of apoptosis induced by T cell-receptor engagement , we identified ALG-4F , a truncated transcript that prevents T cell-receptor-induced FasL upregulation and cell death .
 truncated transcript, ALG-4F, FasL
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:
 truncated transcript, ALG-4F, FasL