2941
Immunohistochemical analysis also revealed that LPS - induced lipocalin - 2 is expressed by brain endothelial cells and is partly co - localised with cyclooxygenase - 2 ( Cox - 2 ) , the rate - limiting enzyme for the production of inflammatory induced prostaglandin E ( 2 ) ( PGE ( 2 ) ) , which is the key mediator of fever .
 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: prostaglandin E ( 2 ); Chemical: PGE ( 2 )