15907
METHODS : C57BL / 6J mice were inoculated , via urethral catheterization , with vehicle control or a prostatectomy - derived strain of P . acnes ( PA2 ) .
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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:
 None