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After extraction , a microdialysis probe was placed at the surgical site for PGE2 and thromboxane B2 ( TXB2 ) measurements .
 Chemical: PGE2; Chemical: thromboxane B2; Chemical: TXB2
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: thromboxane B2; Chemical: TXB2