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Interestingly , the observed response required live bacteria and both IHC and in situ hybridization assays for P . acnes indicated a potential intracellular presence of P . acnes in prostate epithelial cells .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
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