8484
Conditioned medium ( CM ) from osteocytes was added to mouse bone marrow cells for 7 days to assess osteoclastogenesis , or MC3T3 - E1 osteoblasts for 4 - 16 days to measure osteogenic gene expression .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
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