2709
These results , which demonstrate that the Wnt / beta - catenin signaling pathway is an upstream activator of BMP2 expression in osteoblasts , provide novel insights into the nature of functional cross talk integrating the BMP and Wnt / beta - catenin pathways in osteoblastic differentiation and maintenance of skeletal homeostasis .
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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