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Despite the paucity of benefits found so far , well - controlled clinical trials are essential building blocks in the continuing search for more effective treatment of mitochondrial disease , and current trials based on information gained from these prior experiences are in progress .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
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