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In addition , melamine significantly increased COX - 2 expression and prostaglandin E2 ( PGE2 ) production .
 Chemical: melamine; 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: melamine; Chemical: prostaglandin E2; Chemical: PGE2