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These proliferative defects were attributable to modest decreases in mitochondrial respiration [ 3 , 4 ] , even though tumors are mainly glycolytic [ 5 ] and mitochondrial respiratory chain function appears to play a minor role in cell proliferation in vivo [ 6 ] .
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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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