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Here , we report the role each constituent amino acid plays within core peptide using an alanine scan and the amino acid effect on function using a biological antigen presentation assay .
 Chemical: amino acid; Chemical: alanine; Chemical: amino acid
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: alanine; Chemical: amino acid