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We found that resistance to defensin requires the function of both components of this regulatory system , because strains expressing PhoQ without PhoP were still markedly sensitive to defensins .
 protein: PhoQ; protein: defensins; protein: PhoP
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: PhoQ; protein: defensins; protein: PhoP