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To investigate the role of CNN1 in maintaining bone homeostasis , we generated transgenic mice overexpressing Cnn1 under the control of the osteoblast - specific 3 . 6 - kb Col1a1 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:
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