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The structural characteristics of alpha - syn12 peptide were studied based on backbone dihedral angle distributions , free - energy surfaces obtained with different reaction coordinates , favored conformations , the formation of different Turn structures , and the solvent exposure of the hydrophobic residues .
 alpha - syn12 peptide
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 alpha - syn12 peptide