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( J Phys Chem B 115 : 10120 - 10125 , 2011 ) indicate that using a simple model of donor linked with a protein labeled with multiple acceptors , significantly increases the transfer efficiency in comparison with donor - single acceptor system .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
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