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(a) Microfluidic device used for the production of double-layer alginate core agarose shell microdroplet; (b) following steps to produce hollow bacterial cellulose microsphere, including agarose gelling, cellulose secretion, removal of alginate core and bacteria, removal of agarose template and assembly of 3D scaffold, using hollow bacterial cellulose microspheres as building blocks. Adapted from [69].
