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Cu ( 2 + ) can also promote the formation of the beta - hairpin and increase the solvent exposure of hydrophobic residues , which promotes the aggregation of alpha - syn12 peptide .
 Cu ( 2 + ), 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:
 Cu ( 2 + ), alpha - syn12 peptide