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. 2016 Feb 17;6:21253. doi: 10.1038/srep21253

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(a) Micrographs of bubbles generated in a focused flow where the bubble size was controlled in the microfluidic device. (b) Micrographs of the fabricated scaffolds with size-defined pores. (c) Scanning electron micrographs of the cross-section of freeze-dried 3D scaffolds with homogenous spherical geometries and interconnected networks throughout the scaffold interior. Note that the magnified image displayed tunnel formation between pores.