2708
Using a site - directed mutagenesis approach , we confirmed that Wnt / beta - catenin transactivation of BMP2 transcription is directly mediated through the Tcf / Lef response elements in the BMP2 promoter .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 None