22563
The purpose of this study is to investigate the effects of n - hexane extracts from bones and internal organs of Japanese eel , Anguilla japonica ( HEE ) , on cyclooxygenase - 2 ( COX - 2 ) - dependent prostaglandin D2 ( PGD2 ) generation in stem cell factor ( SCF ) , IL - 10 , plus LPS - induced mouse bone marrow - derived mast cells ( BMMCs ) and on passive cutaneous anaphylaxis ( PCA ) in mice .
 Chemical: n - hexane; Chemical: prostaglandin D2; 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: n - hexane; Chemical: prostaglandin D2; Chemical: PGD2