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Similarly bone stiffness - at the start of the experiment 649N / mm - reached 846N / mm at 10weeks in the loaded group and was maintained to the end of the experiment ( 850N / mm ) .
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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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