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Mitochondrial complex I couples electron transfer between matrix NADH and inner - membrane ubiquinone to the pumping of protons against a proton motive force .
 Chemical: NADH; Chemical: ubiquinone
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: NADH; Chemical: ubiquinone