2851
Local beta - adrenergic actions are responsible for the greater cancellous bone volume in leptin - deficient ( ob / ob ) mice ; however , the mechanism responsible for the opposing reduction in cortical bone in ob / ob mice is not known .
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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