21295
MATERIALS AND METHODS : The plant ethanolic extracts were initially tested against lipopolysaccharide ( LPS ) - induced prostaglandin E2 ( PGE2 ) production in RAW264 . 7 mouse macrophages , and interleukin 6 ( IL - 6 ) and tumor necrosis factor ( TNF ) production in human U937 monocytes .
 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