6297
To ascertain the molecular mechanism implicated in the antitumor promoting activity of chrysin , its effect was investigated on markers of tumor promotion and inflammation : ornithine decarboxylase ( ODC ) activity , proliferating cell nuclear antigen ( PCNA ) , inducible nitric oxide synthase ( iNOS ) and cyclo - oxygenase - 2 ( COX - 2 ) expression , and on levels of proinflammatory cytokines interleukin - 6 ( IL - 6 ) , tumor necrosis factor - alpha ( TNF - alpha ) , and prostaglandin E ( 2 ) ( PGE ( 2 ) ) .
 Chemical: chrysin; Chemical: ornithine; Chemical: nitric oxide; 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: chrysin; Chemical: ornithine; Chemical: nitric oxide; Chemical: prostaglandin E ( 2 ); Chemical: PGE ( 2 )