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BACKGROUND / AIMS : Experimental studies have suggested that apoptosis via the Fas / Fas Ligand signaling system may play an important role in the development of acute liver failure .
 Disease: acute liver failure
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 Disease: acute liver failure