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We report on a computer algorithm capable of predicting the location of T-helper-cell epitopes in protein antigen ( Ag ) by analysing the Ag amino acid sequence .
 protein: amino acid sequence; protein: Ag; protein: protein antigen; protein: Ag; protein: T-helper-cell epitopes
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
Answer:
 protein: amino acid sequence; protein: Ag; protein: protein antigen; protein: Ag; protein: T-helper-cell epitopes