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Microscale control of the fiber organization and the porosity at the surface and through the thickness of the fibrous scaffolds , as demonstrated by the results of this study , provides a powerful means of engineering the three - dimensional structure of electrospun fibrous scaffolds for cell and tissue engineering .
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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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