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Because intermittent PTH is more anabolic in Cox - 2 knockout ( KO ) than wild type ( WT ) mice , we hypothesized COX - 2 might contribute to the effects of continuous PTH by suppressing PTH - stimulated differentiation of mesenchymal stem cells into OBs .
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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