22565
To understand the mechanistic basis for the inhibition of PGD2 generation by HEE , we examined the effects of HEE on upstream signaling pathways essential for COX - 2 induction .
 Chemical: PGD2
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: PGD2