23656
Using mass spectrometry to monitor subunit exchange over time it was found that HSP27 and alpha B exchange subunits 23 % faster than the reported rate for HSP27 / alpha A , and almost twice that of alpha A / alpha B .
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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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