13151
The results indicate that TGF - beta 1 undergoes significant conformational changes at both secondary and tertiary structural levels after conjugation to the AuNP surface , which results in the deactivation of TGF - beta 1 protein .
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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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