14441
Using the optimal " polyelectrolyte couples " for constructing the LBL film , basic fibroblast growth factor ( bFGF ) was released gradually over 14 days with retained biological activity to stimulate cell proliferation .
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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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