5579
We performed femoral fractures with internal fixation in transgenic mice that overexpress EphB4 under the collagen type 1 promoter ( Col1 - EphB4 ) and investigated the bone repair process up to 12 weeks postfracture .
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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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