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The defensin sensitivities of Salmonella typhimurium strains with mutations in the phoP/phoQ two-component virulence regulon were tested by using purified defensins NP-1 and NP-2 .
 protein: purified defensins; DNA: phoP/phoQ two-component virulence regulon; protein: NP-1; protein: defensin; protein: NP-2
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: purified defensins; DNA: phoP/phoQ two-component virulence regulon; protein: NP-1; protein: defensin; protein: NP-2