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In an attempt to explore this mechanistic structural aspect of proteins , we present site - specific interaction of hydration water with the major coat protein subunit of filamentous virus Pf1 by magic angle spinning ( MAS ) solid - state NMR .
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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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