29011
Western blot and immunohistochemical experiments revealed a significant down - regulation of beta - catenin and phospho - glycogen synthase kinase - 3 beta ( pSer9 - GSK - 3 beta ) after TCDD exposure .
 Chemical: TCDD
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: TCDD