854
For in vitro mechanistic studies , rat mesenchymal stem cells ( MSCs ) and mouse macrophage cells ( RAW264 . 7 ) were used for studying the effects of ELP on osteogenic / adipogenic differentiations and osteoclastogenesis , respectively .
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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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