1961
PLGA - heparin microspheres released out bFGF in a more sustained manner with a smaller extent of initial burst than PLGA microspheres , indicating that surface immobilized heparin controlled the release rate of bFGF .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Anatomy 
Text: {0} 
Answer:
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