30086
MATERIALS AND METHODS : The present study aimed to investigate the effect of CI ethanolic extract ( CIE ) on productions of nitric oxide ( NO ) , prostaglandin E2 ( PGE2 ) , and interleukin - 1 beta ( IL - 1 beta ) in lipopolysaccharide ( LPS ) - induced RAW264 . 7 macrophages .
 Chemical: nitric oxide; Chemical: NO; 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: nitric oxide; Chemical: NO; Chemical: prostaglandin E2; Chemical: PGE2