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However , the involvement of a specific , terminal prostaglandin ( PG ) isomerase has not been evaluated .
 Chemical: prostaglandin; Chemical: PG
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 Chemical: prostaglandin; Chemical: PG