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Furthermore, we present a new principle for searching Ag for potential amphipatic alpha-helical protein segments .
 protein: amphipatic alpha-helical protein segments; protein: Ag
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: amphipatic alpha-helical protein segments; protein: Ag