25126
Each peptide differs in a single amino acid at its C - terminus , which minimizes the effects of peptide sequences and serves as a model molecule to create positive , neutral and negative charges on the surface of the NPs at pH 4 - 10 .
 Chemical: amino acid; Chemical: C
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 acid; Chemical: C