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Because insertion mutations in phoP are polar on phoQ , we constructed strains that expressed the PhoQ protein in the absence of PhoP to test whether resistance to defensin requires only the phoQ gene product .
 protein: PhoP; DNA: phoQ; protein: PhoQ protein; DNA: phoQ; DNA: phoP; protein: phoQ gene product
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: PhoP; DNA: phoQ; protein: PhoQ protein; DNA: phoQ; DNA: phoP; protein: phoQ gene product