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DPEP induced dose - dependent reduction of the protein levels of inducible nitric oxide synthase ( iNOS ) and cyclooxygenase - 2 ( COX - 2 ) and concomitant reduction in the production of NO and prostaglandin E ( 2 ) ( PGE ( 2 ) ) .
 Chemical: DPEP; Chemical: nitric oxide; Chemical: NO; Chemical: prostaglandin E ( 2 ); Chemical: PGE ( 2 )
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: DPEP; Chemical: nitric oxide; Chemical: NO; Chemical: prostaglandin E ( 2 ); Chemical: PGE ( 2 )