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Their solubility in water and the possibility of chemical modification by targeting the amino or carboxyl terminus give peptide - based nanostructures several advantages over carbon nanotube nanostructures .
 Chemical: amino; Chemical: carboxyl; Chemical: carbon
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: amino; Chemical: carboxyl; Chemical: carbon