1955
MATERIALS AND METHODS : Porous PLGA microspheres having primary amine groups on the surface were prepared using an oil - in - water ( O / W ) single emulsion method using Pluronic F - 127 as an extractable porogen .
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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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