3882
Sclerostin , a product of the SOST gene produced mainly by osteocytes , is a potent negative regulator of bone formation that appears to be responsive to mechanical loading , with SOST expression increasing following mechanical unloading .
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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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