26036
This peptide was chemically synthesized and its three - dimensional structure was solved by NMR analysis and compared to that of TxVA belonging to the same family , revealing very few common structural features apart a common orientation of the intercysteine loop .
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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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