25756
Serum concentrations of PGE2 and COX - 2 were analyzed before , immediately after , and 60 min after immersion .
 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: PGE2