21695
These results suggest that the formation of aromatic clusters involving contiguous residues might be a very efficient process leading to the formation of hydrophobic domains in the early stages of protein folding , well before a hydrophobic collapse into the tertiary structure .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
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