12543
Connexin43 ( Cx43 ) plays a critical role in osteoblast function and bone mass accrual , yet the identity of the second messengers communicated by Cx43 gap junctions , the targets of these second messengers and how they regulate osteoblast function remain largely unknown .
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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