2394
Localization and expression of COX isoforms ( by immunohistochemistry , Western blot ) and PGE ( 2 ) level ( by enzyme immunoassay ) were examined .
 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: PGE ( 2 )