1527
NGF , PGE2 , PGF2alpha and PGI2 were measured using enzyme - linked immunosorbent assay and compared between the groups .
 Chemical: PGE2; Chemical: PGF2alpha; Chemical: PGI2
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: PGE2; Chemical: PGF2alpha; Chemical: PGI2