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PTH also induces cyclooxygenase - 2 ( COX - 2 ) , producing prostaglandin E2 ( PGE2 ) , that can act on both OBs and osteoclasts ( OCs ) .
 Chemical: prostaglandin E2; Chemical: PGE2
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: prostaglandin E2; Chemical: PGE2