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Here we give a first demonstration of using nanoscale sinusoidal mechanotransductive protocols ( 10 - 14 nm displacements at 1 kHz frequency ) , " nanokicking " , to promote osteoblastogenesis in human mesenchymal stem cell cultures .
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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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