21060
We find that the SWCNT displays a general preference over the PRM in binding with SH3 domain in all the three force fields examined , although the degree of preference can be somewhat different , with the AMBER force field showing the highest preference .
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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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